libpng: update 1.6.20 bottle.
libpng: update 1.6.20 bottle.

brunchboy/homebrew,tschoonj/homebrew,zhipeng-jia/homebrew,Homebrew/linuxbrew,sometimesfood/homebrew,ybott/homebrew,alebcay/homebrew,frodeaa/homebrew,knpwrs/homebrew,ento/homebrew,chadcatlett/homebrew,zhipeng-jia/homebrew,danieroux/homebrew,AlexejK/homebrew,ablyler/homebrew,SteveClement/homebrew,dickeyxxx/homebrew,menivaitsi/homebrew,ybott/homebrew,gawbul/homebrew,miketheman/homebrew,Homebrew/linuxbrew,optikfluffel/homebrew,vigo/homebrew,dongcarl/homebrew,treyharris/homebrew,hakamadare/homebrew,yazuuchi/homebrew,emcrisostomo/homebrew,cprecioso/homebrew,influxdata/homebrew,ilovezfs/homebrew,slyphon/homebrew,MartinDelille/homebrew,MartinDelille/homebrew,josa42/homebrew,osimola/homebrew,brunchboy/homebrew,mobileoverlord/homebrew-1,recruit-tech/homebrew,getgauge/homebrew,dutchcoders/homebrew,totalvoidness/homebrew,ilovezfs/homebrew,josa42/homebrew,youtux/homebrew,bukzor/linuxbrew,Homebrew/homebrew,dplarson/homebrew,knpwrs/homebrew,zhipeng-jia/homebrew,Linuxbrew/linuxbrew,3van/homebrew,ExtremeMan/homebrew,dgageot/homebrew,elgertam/homebrew,saketkc/linuxbrew,jconley/homebrew,ablyler/homebrew,pcottle/homebrew,slyphon/homebrew,influxdb/homebrew,miketheman/homebrew,cosmo0920/homebrew,pcottle/homebrew,drbenmorgan/linuxbrew,dericed/homebrew,OJFord/homebrew,arnested/homebrew,reelsense/linuxbrew,kenips/homebrew,drewwells/homebrew,totalvoidness/homebrew,apjanke/homebrew,decors/homebrew,jiashuw/homebrew,jconley/homebrew,johanhammar/homebrew,hanxue/homebrew,scpeters/homebrew,reelsense/homebrew,BrewTestBot/homebrew,theeternalsw0rd/homebrew,Homebrew/homebrew,ablyler/homebrew,DoomHammer/linuxbrew,dgageot/homebrew,mactkg/homebrew,gnubila-france/linuxbrew,kevinastone/homebrew,reelsense/linuxbrew,iostat/homebrew2,dickeyxxx/homebrew,hyuni/homebrew,utzig/homebrew,kenips/homebrew,DoomHammer/linuxbrew,tutumcloud/homebrew,thinker0/homebrew,retrography/homebrew,slyphon/homebrew,hongkongkiwi/homebrew,dongcarl/homebrew,ilovezfs/homebrew,bukzor/linuxbrew,Chilledheart/homebrew,miketheman/homebrew,bukzor/linuxbrew,mkrapp/homebrew,royhodgman/homebrew,hanxue/homebrew,cprecioso/homebrew,LinusU/homebrew,Angeldude/linuxbrew,treyharris/homebrew,Linuxbrew/linuxbrew,MoSal/homebrew,skinny-framework/homebrew,elgertam/homebrew,youtux/homebrew,elgertam/homebrew,gicmo/homebrew,zchee/homebrew,bukzor/linuxbrew,adamliter/homebrew,kenips/homebrew,retrography/homebrew,tutumcloud/homebrew,mobileoverlord/homebrew-1,hongkongkiwi/homebrew,dalanmiller/homebrew,gnubila-france/linuxbrew,yumitsu/homebrew,optikfluffel/homebrew,brunchboy/homebrew,feelpp/homebrew,Asuranceturix/homebrew,lrascao/homebrew,youtux/homebrew,3van/homebrew,jsjohnst/homebrew,pdxdan/homebrew,AlexejK/homebrew,slyphon/homebrew,sjackman/linuxbrew,Red54/homebrew,tutumcloud/homebrew,reelsense/homebrew,pdxdan/homebrew,emcrisostomo/homebrew,princeofdarkness76/homebrew,georgschoelly/homebrew,danieroux/homebrew,tschoonj/homebrew,jamer/homebrew,marcwebbie/homebrew,feelpp/homebrew,brunchboy/homebrew,esamson/homebrew,afh/homebrew,vigo/homebrew,Red54/homebrew,kodabb/homebrew,osimola/homebrew,DoomHammer/linuxbrew,liamstask/homebrew,youtux/homebrew,TaylorMonacelli/homebrew,ybott/homebrew,ExtremeMan/homebrew,getgauge/homebrew,kevinastone/homebrew,scpeters/homebrew,keith/homebrew,thinker0/homebrew,keith/homebrew,influxdb/homebrew,yazuuchi/homebrew,gicmo/homebrew,TaylorMonacelli/homebrew,eighthave/homebrew,bigbes/homebrew,marcwebbie/homebrew,dunn/homebrew,OJFord/homebrew,Angeldude/linuxbrew,filcab/homebrew,princeofdarkness76/homebrew,zchee/homebrew,mobileoverlord/homebrew-1,MartinDelille/homebrew,dplarson/homebrew,jarrettmeyer/homebrew,benjaminfrank/homebrew,skatsuta/homebrew,MoSal/homebrew,dgageot/homebrew,3van/homebrew,zchee/homebrew,arnested/homebrew,yazuuchi/homebrew,polishgeeks/homebrew,SteveClement/homebrew,afh/homebrew,base10/homebrew,elyscape/homebrew,yazuuchi/homebrew,drbenmorgan/linuxbrew,royhodgman/homebrew,michaKFromParis/homebrew-sparks,redpen-cc/homebrew,galaxy001/homebrew,recruit-tech/homebrew,theeternalsw0rd/homebrew,zhipeng-jia/homebrew,Red54/homebrew,jconley/homebrew,ralic/homebrew,pcottle/homebrew,benjaminfrank/homebrew,base10/homebrew,pcottle/homebrew,mmizutani/homebrew,base10/homebrew,johanhammar/homebrew,tutumcloud/homebrew,skinny-framework/homebrew,scorphus/homebrew,redpen-cc/homebrew,reelsense/linuxbrew,decors/homebrew,hyuni/homebrew,ryanfb/homebrew,decors/homebrew,teslamint/homebrew,jconley/homebrew,galaxy001/homebrew,gawbul/homebrew,skatsuta/homebrew,afh/homebrew,SteveClement/homebrew,ralic/homebrew,jiashuw/homebrew,joshfriend/homebrew,ento/homebrew,sometimesfood/homebrew,hyuni/homebrew,johanhammar/homebrew,Chilledheart/homebrew,Angeldude/linuxbrew,hakamadare/homebrew,joshfriend/homebrew,ebouaziz/linuxbrew,kenips/homebrew,sjackman/linuxbrew,AlexejK/homebrew,haihappen/homebrew,nelstrom/homebrew,jamer/homebrew,royhodgman/homebrew,Asuranceturix/homebrew,ybott/homebrew,dickeyxxx/homebrew,ablyler/homebrew,hongkongkiwi/homebrew,sakra/homebrew,knpwrs/homebrew,muellermartin/homebrew,osimola/homebrew,saketkc/linuxbrew,nelstrom/homebrew,davydden/linuxbrew,gicmo/homebrew,mkrapp/homebrew,menivaitsi/homebrew,iandennismiller/homebrew,kodabb/homebrew,sakra/homebrew,manphiz/homebrew,hakamadare/homebrew,danieroux/homebrew,polishgeeks/homebrew,deorth/homebrew,ear/homebrew,elgertam/homebrew,nelstrom/homebrew,cprecioso/homebrew,jab/homebrew,menivaitsi/homebrew,DoomHammer/linuxbrew,hyuni/homebrew,utzig/homebrew,MartinDelille/homebrew,vigo/homebrew,scorphus/homebrew,teslamint/homebrew,georgschoelly/homebrew,jamer/homebrew,benjaminfrank/homebrew,feelpp/homebrew,lrascao/homebrew,keith/homebrew,sakra/homebrew,cscetbon/homebrew,tschoonj/homebrew,treyharris/homebrew,dunn/homebrew,SuperNEMO-DBD/cadfaelbrew,ilovezfs/homebrew,davydden/linuxbrew,iandennismiller/homebrew,quantumsteve/homebrew,kevinastone/homebrew,Homebrew/homebrew,cosmo0920/homebrew,influxdata/homebrew,galaxy001/homebrew,georgschoelly/homebrew,blogabe/homebrew,ralic/homebrew,booi/homebrew,MoSal/homebrew,gnubila-france/linuxbrew,Asuranceturix/homebrew,frodeaa/homebrew,royhodgman/homebrew,alebcay/homebrew,Angeldude/linuxbrew,dutchcoders/homebrew,jsjohnst/homebrew,thinker0/homebrew,knpwrs/homebrew,deorth/homebrew,teslamint/homebrew,retrography/homebrew,elyscape/homebrew,jarrettmeyer/homebrew,esamson/homebrew,marcwebbie/homebrew,skatsuta/homebrew,nandub/homebrew,iostat/homebrew2,nandub/homebrew,dongcarl/homebrew,filcab/homebrew,dongcarl/homebrew,influxdata/homebrew,nandub/homebrew,influxdb/homebrew,LinusU/homebrew,gnubila-france/linuxbrew,johanhammar/homebrew,afh/homebrew,influxdata/homebrew,yumitsu/homebrew,Chilledheart/homebrew,marcwebbie/homebrew,scorphus/homebrew,quantumsteve/homebrew,keith/homebrew,utzig/homebrew,sakra/homebrew,MoSal/homebrew,getgauge/homebrew,teslamint/homebrew,ear/homebrew,dutchcoders/homebrew,Red54/homebrew,galaxy001/homebrew,deorth/homebrew,mactkg/homebrew,arnested/homebrew,decors/homebrew,hanxue/homebrew,retrography/homebrew,SteveClement/homebrew,utzig/homebrew,sjackman/linuxbrew,jsjohnst/homebrew,iandennismiller/homebrew,princeofdarkness76/homebrew,Homebrew/linuxbrew,gicmo/homebrew,drbenmorgan/linuxbrew,mmizutani/homebrew,josa42/homebrew,ear/homebrew,nandub/homebrew,SteveClement/homebrew,scorphus/homebrew,eighthave/homebrew,jarrettmeyer/homebrew,liamstask/homebrew,ExtremeMan/homebrew,haihappen/homebrew,pdxdan/homebrew,cscetbon/homebrew,booi/homebrew,3van/homebrew,jab/homebrew,georgschoelly/homebrew,mmizutani/homebrew,influxdb/homebrew,adamliter/homebrew,frodeaa/homebrew,mactkg/homebrew,davydden/linuxbrew,drewwells/homebrew,arnested/homebrew,ryanfb/homebrew,booi/homebrew,jsjohnst/homebrew,esamson/homebrew,apjanke/homebrew,iandennismiller/homebrew,bigbes/homebrew,bigbes/homebrew,adamliter/homebrew,Homebrew/homebrew,Homebrew/linuxbrew,emcrisostomo/homebrew,elyscape/homebrew,recruit-tech/homebrew,vigo/homebrew,nelstrom/homebrew,lrascao/homebrew,theeternalsw0rd/homebrew,ralic/homebrew,liamstask/homebrew,SuperNEMO-DBD/cadfaelbrew,dutchcoders/homebrew,thinker0/homebrew,elyscape/homebrew,cosmo0920/homebrew,drewwells/homebrew,LinusU/homebrew,recruit-tech/homebrew,apjanke/homebrew,sjackman/linuxbrew,chadcatlett/homebrew,mmizutani/homebrew,zchee/homebrew,hakamadare/homebrew,jab/homebrew,hanxue/homebrew,yumitsu/homebrew,ryanfb/homebrew,dericed/homebrew,tschoonj/homebrew,redpen-cc/homebrew,joshfriend/homebrew,cscetbon/homebrew,frodeaa/homebrew,saketkc/linuxbrew,kodabb/homebrew,hongkongkiwi/homebrew,cosmo0920/homebrew,esamson/homebrew,emcrisostomo/homebrew,michaKFromParis/homebrew-sparks,BrewTestBot/homebrew,dunn/homebrew,sferik/homebrew,filcab/homebrew,manphiz/homebrew,davydden/linuxbrew,scpeters/homebrew,alebcay/homebrew,manphiz/homebrew,mobileoverlord/homebrew-1,reelsense/linuxbrew,mkrapp/homebrew,miketheman/homebrew,jab/homebrew,dplarson/homebrew,mactkg/homebrew,ento/homebrew,blogabe/homebrew,Chilledheart/homebrew,Linuxbrew/linuxbrew,ento/homebrew,muellermartin/homebrew,bigbes/homebrew,dunn/homebrew,muellermartin/homebrew,skatsuta/homebrew,iostat/homebrew2,Asuranceturix/homebrew,liamstask/homebrew,dalanmiller/homebrew,Linuxbrew/linuxbrew,drbenmorgan/linuxbrew,kodabb/homebrew,ear/homebrew,jarrettmeyer/homebrew,dplarson/homebrew,blogabe/homebrew,getgauge/homebrew,gawbul/homebrew,LinusU/homebrew,iostat/homebrew2,michaKFromParis/homebrew-sparks,quantumsteve/homebrew,base10/homebrew,polishgeeks/homebrew,dericed/homebrew,saketkc/linuxbrew,sferik/homebrew,jamer/homebrew,TaylorMonacelli/homebrew,sometimesfood/homebrew,quantumsteve/homebrew,theeternalsw0rd/homebrew,chadcatlett/homebrew,SuperNEMO-DBD/cadfaelbrew,ryanfb/homebrew,sferik/homebrew,reelsense/homebrew,alebcay/homebrew,BrewTestBot/homebrew,adamliter/homebrew,TaylorMonacelli/homebrew,eighthave/homebrew,haihappen/homebrew,OJFord/homebrew,jiashuw/homebrew,ebouaziz/linuxbrew,OJFord/homebrew,dgageot/homebrew,BrewTestBot/homebrew,apjanke/homebrew,sometimesfood/homebrew,SuperNEMO-DBD/cadfaelbrew,optikfluffel/homebrew,kevinastone/homebrew,filcab/homebrew,eighthave/homebrew,muellermartin/homebrew,Asuranceturix/homebrew,ExtremeMan/homebrew,AlexejK/homebrew,ebouaziz/linuxbrew,dickeyxxx/homebrew,danieroux/homebrew,princeofdarkness76/homebrew,polishgeeks/homebrew,pdxdan/homebrew,redpen-cc/homebrew,osimola/homebrew,jiashuw/homebrew,totalvoidness/homebrew,ebouaziz/linuxbrew,reelsense/homebrew,dericed/homebrew,manphiz/homebrew,blogabe/homebrew,pcottle/homebrew,benjaminfrank/homebrew,skinny-framework/homebrew,treyharris/homebrew,haihappen/homebrew,dalanmiller/homebrew,totalvoidness/homebrew,scpeters/homebrew,sferik/homebrew,skinny-framework/homebrew,cprecioso/homebrew,menivaitsi/homebrew,feelpp/homebrew,optikfluffel/homebrew,dalanmiller/homebrew,drewwells/homebrew