libpng: update 1.6.19 bottle.
libpng: update 1.6.19 bottle.

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homebrew,BrewTestBot/homebrew,TaylorMonacelli/homebrew,nelstrom/homebrew,getgauge/homebrew,hongkongkiwi/homebrew,feelpp/homebrew,okuramasafumi/homebrew,DoomHammer/linuxbrew,Gasol/homebrew,slyphon/homebrew,SteveClement/homebrew,marcusandre/homebrew,koraktor/homebrew,iandennismiller/homebrew,sakra/homebrew,LinusU/homebrew,theeternalsw0rd/homebrew,kad/homebrew,pcottle/homebrew,elyscape/homebrew,MartinDelille/homebrew,moyogo/homebrew,blogabe/homebrew,danieroux/homebrew,recruit-tech/homebrew,grepnull/homebrew,SteveClement/homebrew,ybott/homebrew,cscetbon/homebrew,AlexejK/homebrew,frodeaa/homebrew,xyproto/homebrew,reelsense/homebrew,jarrettmeyer/homebrew,jamer/homebrew,Linuxbrew/linuxbrew,danieroux/homebrew,lvicentesanchez/homebrew,ybott/homebrew,ear/homebrew,pdpi/homebrew,DoomHammer/linuxbrew,koraktor/homebrew,menivaitsi/homebrew,muellermartin/homebrew,SuperNEMO-DBD/cadfaelbrew,geoff-codes/homebrew,base10/homebrew,lmontrieux/homebrew,knpwrs/homebrew,joshfriend/homebrew,knpwrs/homebrew,michaKFromParis/homebrew-sparks,BrewTestBot/homebrew,georgschoelly/homebrew,TaylorMonacelli/homebrew,codeout/homebrew,lvicentesanchez/linuxbrew,alex/homebrew,dkotvan/homebrew,tutumcloud/homebrew,dkotvan/homebrew,Gasol/homebrew,influxdb/homebrew,iandennismiller/homebrew,retrography/homebrew,afh/homebrew,LinusU/homebrew,scpeters/homebrew,cchacin/homebrew,optikfluffel/homebrew,3van/homebrew,vigo/homebrew,influxdb/homebrew,dkotvan/homebrew,sferik/homebrew,decors/homebrew,vihangm/homebrew,ento/homebrew,keith/homebrew,nandub/homebrew,reelsense/homebrew,ento/homebrew,dalanmiller/homebrew,MoSal/homebrew,manphiz/homebrew,kenips/homebrew,yazuuchi/homebrew,keith/homebrew,ento/homebrew,jconley/homebrew,ablyler/homebrew,lmontrieux/homebrew,royhodgman/homebrew,galaxy001/homebrew,optikfluffel/homebrew,lvicentesanchez/linuxbrew,retrography/homebrew,AGWA-forks/homebrew,tutumcloud/homebrew,Red54/homebrew,jedahan/homebrew,tstack/homebrew,dkotvan/homebrew,gicmo/homebrew,ybott/homebrew,deorth/homebrew,a-b/homebrew,ge11232002/homebrew,gvangool/homebrew,sometimesfood/homebrew,ear/homebrew,skatsuta/homebrew,scorphus/homebrew,tseven/homebrew,TaylorMonacelli/homebrew,gawbul/homebrew,petere/homebrew,osimola/homebrew,zchee/homebrew,danabrand/linuxbrew,gicmo/homebrew,slyphon/homebrew,jconley/homebrew,mkrapp/homebrew,liamstask/homebrew,totalvoidness/homebrew,treyharris/homebrew,grepnull/homebrew,tjschuck/homebrew,Habbie/homebrew,saketkc/linuxbrew,apjanke/homebrew,treyharris/homebrew,saketkc/linuxbrew,jmagnusson/homebrew,galaxy001/homebrew,ilovezfs/homebrew,gicmo/homebrew,drewwells/homebrew,bigbes/homebrew,dutchcoders/homebrew,jsjohnst/homebrew,sometimesfood/homebrew,kad/homebrew,eighthave/homebrew,Homebrew/homebrew,jamer/homebrew,totalvoidness/homebrew,alebcay/homebrew,gnawhleinad/homebrew,marcusandre/homebrew,getgauge/homebrew,kenips/homebrew,lvicentesanchez/linuxbrew,lvicentesanchez/homebrew,galaxy001/homebrew,danabrand/linuxbrew,mactkg/homebrew,booi/homebrew,scorphus/homebrew,benjaminfrank/homebrew,eighthave/homebrew,MartinDelille/homebrew,razamatan/homebrew,gnubila-france/linuxbrew,alex/homebrew,frickler01/homebrew,tsaeger/homebrew,pcottle/homebrew,max-horvath/homebrew,jab/homebrew,sjackman/linuxbrew,blogabe/homebrew,tseven/homebrew,pdpi/homebrew,reelsense/linuxbrew,danieroux/homebrew,hanxue/homebrew,reelsense/homebrew,jarrettmeyer/homebrew,michaKFromParis/homebrew-sparks,Asuranceturix/homebrew,razamatan/homebrew,zeha/homebrew,drbenmorgan/linuxbrew,chadcatlett/homebrew,sjackman/linuxbrew,nandub/homebrew,kad/homebrew,recruit-tech/homebrew,zchee/homebrew,pdxdan/homebrew,xcezx/homebrew,kevinastone/homebrew,thinker0/homebrew,tseven/homebrew,ablyler/homebrew,AGWA-forks/homebrew,getgauge/homebrew,tjschuck/homebrew,nelstrom/homebrew,bigbes/homebrew,Habbie/homebrew,youtux/homebrew,filcab/homebrew,osimola/homebrew,megahall/homebrew,dgageot/homebrew,apjanke/homebrew,haihappen/homebrew,nandub/homebrew,dongcarl/homebrew,emcrisostomo/homebrew,mmizutani/homebrew,brunchboy/homebrew,manphiz/homebrew,royhodgman/homebrew,dolfly/homebrew,frickler01/homebrew,bchatard/homebrew,thinker0/homebrew,skatsuta/homebrew,manphiz/homebrew,menivaitsi/homebrew,Chilledheart/homebrew,quantumsteve/homebrew,SteveClement/homebrew,yumitsu/homebrew,benjaminfrank/homebrew,gnawhleinad/homebrew,nelstrom/homebrew,treyharris/homebrew,iostat/homebrew2,deorth/homebrew,AlexejK/homebrew,hakamadare/homebrew,dunn/homebrew,jamer/homebrew,zhipeng-jia/homebrew,dgageot/homebrew,koraktor/homebrew,joshfriend/homebrew,drewwells/homebrew,youtux/homebrew,patrickmckenna/homebrew,yazuuchi/homebrew,OJFord/homebrew,afh/homebrew,Chilledheart/homebrew,davydden/linuxbrew,Linuxbrew/linuxbrew,hanxue/homebrew,kodabb/homebrew,emcrisostomo/homebrew,gawbul/homebrew,frodeaa/homebrew,ExtremeMan/homebrew,osimola/homebrew,Angeldude/linuxbrew,zchee/homebrew,cHoco/homebrew,yazuuchi/homebrew,patrickmckenna/homebrew,gnawhleinad/homebrew,bchatard/homebrew,esamson/homebrew,geoff-codes/homebrew,skinny-framework/homebrew,base10/homebrew,xyproto/homebrew,SuperNEMO-DBD/cadfaelbrew,xyproto/homebrew,gvangool/homebrew,AGWA-forks/homebrew,Homebrew/linuxbrew,apjanke/homebrew,LonnyGomes/homebrew,ge11232002/homebrew,ralic/homebrew,tutumcloud/homebrew,bukzor/linuxbrew,zhipeng-jia/homebrew,lmontrieux/homebrew,MoSal/homebrew,jeremiahyan/homebrew,princeofdarkness76/homebrew,manphiz/homebrew,gnawhleinad/homebrew,max-horvath/homebrew,lmontrieux/homebrew,sferik/homebrew,kenips/homebrew,jiashuw/homebrew,jsjohnst/homebrew,decors/homebrew,zchee/homebrew,keith/homebrew,iostat/homebrew2,jiashuw/homebrew,bchatard/homebrew,patrickmckenna/homebrew,hakamadare/homebrew,jeremiahyan/homebrew,jmagnusson/homebrew,elgertam/homebrew,jiashuw/homebrew,kodabb/homebrew,ExtremeMan/homebrew,MoSal/homebrew,bchatard/homebrew,blogabe/homebrew,adamliter/homebrew,davidcelis/homebrew,petere/homebrew,reelsense/linuxbrew,danabrand/linuxbrew,gnubila-france/linuxbrew,dolfly/homebrew,ear/homebrew,polishgeeks/homebrew,xcezx/homebrew,scorphus/homebrew,josa42/homebrew,ralic/homebrew,apjanke/homebrew,SuperNEMO-DBD/cadfaelbrew,nelstrom/homebrew,menivaitsi/homebrew,ralic/homebrew,grepnull/homebrew,drewwells/homebrew,dunn/homebrew,marcwebbie/homebrew,pdxdan/homebrew,dickeyxxx/homebrew,dericed/homebrew,decors/homebrew,dericed/homebrew,tsaeger/homebrew,moyogo/homebrew,ehamberg/homebrew,Linuxbrew/linuxbrew,marcwebbie/homebrew,jedahan/homebrew,tutumcloud/homebrew,moyogo/homebrew,knpwrs/homebrew,xcezx/homebrew,DoomHammer/linuxbrew,eighthave/homebrew,ento/homebrew,filcab/homebrew,frodeaa/homebrew,cHoco/homebrew,theeternalsw0rd/homebrew,quantumsteve/homebrew,mactkg/homebrew,pdxdan/homebrew,dickeyxxx/homebrew,joshua-rutherford/homebrew,gnubila-france/linuxbrew,geoff-codes/homebrew,influxdata/homebrew,megahall/homebrew,base10/homebrew,Linuxbrew/linuxbrew,tschoonj/homebrew,slyphon/homebrew,hongkongkiwi/homebrew,dickeyxxx/homebrew,influxdb/homebrew,hakamadare/homebrew,geoff-codes/homebrew,cosmo0920/homebrew,AlexejK/homebrew,bigbes/homebrew,BrewTestBot/homebrew,tsaeger/homebrew,booi/homebrew,emcrisostomo/homebrew,filcab/homebrew,ehamberg/homebrew,cosmo0920/homebrew,benjaminfrank/homebrew,retrography/homebrew,felixonmars/homebrew,elyscape/homebrew,hyuni/homebrew,hanxue/homebrew,jarrettmeyer/homebrew,TaylorMonacelli/homebrew,arnested/homebrew,skatsuta/homebrew,skinny-framework/homebrew,influxdata/homebrew,LinusU/homebrew,cscetbon/homebrew,esamson/homebrew,polishgeeks/homebrew,feelpp/homebrew,Red54/homebrew,codeout/homebrew,joshua-rutherford/homebrew,dutchcoders/homebrew,MoSal/homebrew,georgschoelly/homebrew,bukzor/linuxbrew,vigo/homebrew,cprecioso/homebrew,michaKFromParis/homebrew-sparks,kevinastone/homebrew,OJFord/homebrew,royhodgman/homebrew,vigo/homebrew,ehamberg/homebrew,pcottle/homebrew,reelsense/linuxbrew,johanhammar/homebrew,johanhammar/homebrew,royhodgman/homebrew,cprecioso/homebrew,princeofdarkness76/homebrew,megahall/homebrew,a-b/homebrew,davidcelis/homebrew,dutchcoders/homebrew,chadcatlett/homebrew,pdpi/homebrew,cchacin/homebrew,quantumsteve/homebrew,getgauge/homebrew,hyuni/homebrew,influxdb/homebrew,elgertam/homebrew,joshua-rutherford/homebrew,cchacin/homebrew,ilovezfs/homebrew,lrascao/homebrew,Gasol/homebrew,vihangm/homebrew,jarrettmeyer/homebrew,moyogo/homebrew,jsjohnst/homebrew,codeout/homebrew,dericed/homebrew,joshfriend/homebrew,Asuranceturix/homebrew,haihappen/homebrew,lvicentesanchez/homebrew,jedahan/homebrew,Habbie/homebrew,dgageot/homebrew,iandennismiller/homebrew,sferik/homebrew,dericed/homebrew,sjackman/linuxbrew,theeternalsw0rd/homebrew,saketkc/linuxbrew,dongcarl/homebrew,zhipeng-jia/homebrew,alebcay/homebrew,decors/homebrew,ExtremeMan/homebrew,petere/homebrew,galaxy001/homebrew,skinny-framework/homebrew,frodeaa/homebrew,lrascao/homebrew,totalvoidness/homebrew,totalvoidness/homebrew,kenips/homebrew,scpeters/homebrew,ilovezfs/homebrew,davidcelis/homebrew,petere/homebrew,blogabe/homebrew,saketkc/linuxbrew,max-horvath/homebrew,danieroux/homebrew,pcottle/homebrew,kodabb/homebrew,adamliter/homebrew,afh/homebrew,gvangool/homebrew,razamatan/homebrew,liamstask/homebrew,a-b/homebrew,MartinDelille/homebrew,DoomHammer/linuxbrew,ebouaziz/linuxbrew,ge11232002/homebrew,jsjohnst/homebrew,jeremiahyan/homebrew,AGWA-forks/homebrew,recruit-tech/homebrew,recruit-tech/homebrew,mobileoverlord/homebrew-1,influxdata/homebrew,okuramasafumi/homebrew,Red54/homebrew