update CHANGELOG
update CHANGELOG

/cc @cbednarski - I try to do this after every PR just so I don't
forget, not a bad practice to get into. This is perhaps arguably an
"improvement" but I think due to the magnitude of code change I think
its worth it in the features sectin. :)

stagrlee/packer,ChrisLundquist/packer,visioncritical/packer,KFishner/packer,rickard-von-essen/packer,Akasurde/packer,avldya/packer,monsterzz/packer,aneeshusa/packer,yoctocloud/packer,yoctocloud/packer,styro/packer,ldejager/packer,monkeylittleinc/packer,bhcleek/packer,grange74/packer,icnocop/packer,quantang/packer,mkuzmin/packer,kgrvamsi/packer,mefellows/packer,napramirez/packer,jasonchaffee/packer,ttaylor249/packer,bradparks/packer__create_vm_for_aws_docker_vagrant_etc,Cbeck527/packer,zakuro9715/packer,oliviertremblay/packer,tomwilkie/packer,mefellows/packer,justincampbell/packer,mayflower/packer,ephemeralsnow/packer,yonglehou/packer,mitchellh/packer,tsmolka/packer,youhong316/packer,smaato/packer,ricardclau/packer,atlassian/packer,dev-head/packer,ephemeralsnow/packer,napramirez/packer,KohlsTechnology/packer,manicai/packer,jae2/packer,sobrinho/packer,jmptrader/packer,pieter-lazzaro/packer,BayanGroup/packer,KohlsTechnology/packer,sean-/packer,mwhooker/packer,jonathankarsh/packer,rk295/packer,dayglojesus/packer,orivej/packer,p1-nico/packer,oliviertremblay/packer,kpettijohn/packer,bryson/packer,jamesleech/packer,jimmythedog/packer,higebu/packer,Sheile/packer,jsternberg/packer,dantran/packer,jgkim/packer,israelshirk/packer,masbog/packer,danschaffer/packer,KFishner/packer,orivej/packer,mwhooker/packer,jean/packer,tas50/packer,orivej/packer,markpeek/packer,hazelesque/packer,jamesbishopp/packer,blairham/packer,grange74/packer,legal90/packer,vtolstov/packer,bryson/packer,zeliff/packer,bensojona/packer,mefellows/packer,dieu/packer,icnocop/packer,sansb/packer,yonglehou/packer,tsmolka/packer,dieu/packer,oliviertremblay/packer,mansunkuo/packer,c22/packer,paulmey/packer,youhong316/packer,paulmey/packer,israelshirk/packer,israelshirk/packer,blairham/packer,gbarberi/packer,mkuzmin/packer,youhong316/packer,mefellows/packer,KohlsTechnology/packer,mitchellh/packer,marklap/packer,timsutton/packer,stagrlee/packer,gbarberi/packer,tomwilkie/packer,bhcleek/packer,icnocop/packer,jen20/packer,mafrosis/packer,eranchetz/packer,pecigonzalo/packer,sean-/packer,gildas/packer-hyperv,atlassian/packer,quantang/packer,lantrix/packer,esemplare/packer,manicai/packer,gildas/packer-hyperv,kpettijohn/packer,bryson/packer,boumenot/packer,sean-/packer,tb3088/packer,leroux/packer,evertrue/packer,noplay/packer,bensojona/packer,marklap/packer,feateds/packer,jasonchaffee/packer,masbog/packer,lantrix/packer,jamesleech/packer,taliesins/packer,jarl-dk/packer,Sheile/packer,pieter-lazzaro/packer,ttaylor249/packer,dantran/packer,zhuzhih2017/packer,samdunne/packer,vtolstov/packer,legal90/packer,higebu/packer,jsternberg/packer,napramirez/packer,marc-ta/packer,btd/packer,pieter-lazzaro/packer,hashicorp/packer,marc-ta/packer,mohae/packer,jamesbishopp/packer,ricardclau/packer,ChrisLundquist/packer,dev-head/packer,Sheile/packer,legal90/packer,timsutton/packer,markpeek/packer,zeliff/packer,sgirones/packer,jimmythedog/packer,kgrvamsi/packer,LinusU/packer,dave2/packer,dayglojesus/packer,taliesins/packer,p1-nico/packer,jimmythedog/packer,mohae/packer,atlassian/packer,taliesins/packer,mafrosis/packer,markpeek/packer,aneeshusa/packer,pvandervelde/packer,beni55/packer,eranchetz/packer,mkuzmin/packer,ricardclau/packer,mohae/packer,jean/packer,jae2/packer,visioncritical/packer,vtolstov/packer,ephemeralsnow/packer,DualSpark/packer,evertrue/packer,esemplare/packer,mayflower/packer,hashicorp/packer,tsmolka/packer,justincampbell/packer,zhuzhih2017/packer,arizvisa/packer,timsutton/packer,p1-nico/packer,rodm/packer,hasJackb/packer,rickard-von-essen/packer,sneal/packer,marc-ta/packer,bhcleek/packer,pearkes/packer,grange74/packer,mwhooker/packer,zeliff/packer,sean-/packer,sneal/packer,smaato/packer,dayglojesus/packer,Silver90/packer,sobrinho/packer,oliviertremblay/packer,zhuzhih2017/packer,pvanbuijtene/packer,jen20/packer,hasJackb/packer,stagrlee/packer,bhcleek/packer,rnaveiras/packer,jasonchaffee/packer,paulvollmer/packer,esemplare/packer,LinusU/packer,hasJackb/packer,dave2/packer,threatstream/packer,p1-nico/packer,life360/packer,AlphaStaxLLC/packer,jimmythedog/packer,tsmolka/packer,ChrisLundquist/packer,paulmey/packer,mansunkuo/packer,israelshirk/packer,rrva/packer,higebu/packer,jsternberg/packer,dayglojesus/packer,jarl-dk/packer,mafrosis/packer,DualSpark/packer,jarl-dk/packer,monsterzz/packer,sequenceiq/packer,jasonchaffee/packer,trumant/packer,c22/packer,ttaylor249/packer,jamesbishopp/packer,dave2/packer,life360/packer,sequenceiq/packer,zakuro9715/packer,c22/packer,Akasurde/packer,dev-head/packer,DualSpark/packer,monsterzz/packer,jen20/packer,sansb/packer,pvandervelde/packer,kgrvamsi/packer,boumenot/packer,mayflower/packer,zakuro9715/packer,beni55/packer,KFishner/packer,dayglojesus/packer,esemplare/packer,sneal/packer,kgrvamsi/packer,Cbeck527/packer,vtolstov/packer,grubernaut/packer,jean/packer,jonathankarsh/packer,napramirez/packer,trumant/packer,BayanGroup/packer,dieu/packer,avldya/packer,AlphaStaxLLC/packer,mitchellh/packer,leroux/packer,rickard-von-essen/packer,pvanbuijtene/packer,paulvollmer/packer,danschaffer/packer,jen20/packer,grubernaut/packer,smaato/packer,marklap/packer,danschaffer/packer,mvanholsteijn/packer,monkeylittleinc/packer,grubernaut/packer,jean/packer,tas50/packer,quantang/packer,jmptrader/packer,DualSpark/packer,Xiol/packer,mgk/packer,mwhooker/packer,feateds/packer,sequenceiq/packer,tsmolka/packer,jimmythedog/packer,Silver90/packer,pieter-lazzaro/packer,tb3088/packer,yoctocloud/packer,jgkim/packer,sansb/packer,burnzy/packer,ricardclau/packer,jsternberg/packer,markpeek/packer,Xiol/packer,fnoeding/packer,youhong316/packer,markpeek/packer,rrva/packer,dantran/packer,BayanGroup/packer,threatstream/packer,pieter-lazzaro/packer,burnzy/packer,kpettijohn/packer,smaato/packer,mgk/packer,bryson/packer,sgirones/packer,marklap/packer,burnzy/packer,beni55/packer,ttaylor249/packer,ldejager/packer,tas50/packer,Cbeck527/packer,smaato/packer,trumant/packer,sgirones/packer,rodm/packer,life360/packer,danschaffer/packer,ldejager/packer,btd/packer,pearkes/packer,pvandervelde/packer,styro/packer,jamesleech/packer,mansunkuo/packer,BayanGroup/packer,btd/packer,arizvisa/packer,rk295/packer,samdunne/packer,gildas/packer-hyperv,bensojona/packer,bradparks/packer__create_vm_for_aws_docker_vagrant_etc,Cbeck527/packer,life360/packer,arizvisa/packer,monkeylittleinc/packer,noplay/packer,boumenot/packer,mitchellh/packer,esemplare/packer,stagrlee/packer,burnzy/packer,marc-ta/packer,justincampbell/packer,tb3088/packer,eranchetz/packer,jasonchaffee/packer,threatstream/packer,leroux/packer,dantran/packer,lantrix/packer,arizvisa/packer,legal90/packer,gbarberi/packer,tb3088/packer,jamesbishopp/packer,routelastresort/packer,pvandervelde/packer,ChrisLundquist/packer,grubernaut/packer,visioncritical/packer,rickard-von-essen/packer,grubernaut/packer,styro/packer,LinusU/packer,rnaveiras/packer,bradparks/packer__create_vm_for_aws_docker_vagrant_etc,hashicorp/packer,pieter-lazzaro/packer,atlassian/packer,mkuzmin/packer,mkuzmin/packer,rrva/packer,higebu/packer,ChrisLundquist/packer,c22/packer,dieu/packer,hasJackb/packer,bryson/packer,feateds/packer,higebu/packer,sobrinho/packer,fnoeding/packer,mvanholsteijn/packer,mafrosis/packer,AlphaStaxLLC/packer,tsmolka/packer,mohae/packer,bhcleek/packer,legal90/packer,manicai/packer,rickard-von-essen/packer,mgk/packer,atlassian/packer,grange74/packer,mitchellh/packer,tas50/packer,dave2/packer,justincampbell/packer,zakuro9715/packer,sneal/packer,evertrue/packer,zhuzhih2017/packer,rnaveiras/packer,blairham/packer,rodm/packer,arizvisa/packer,manicai/packer,KohlsTechnology/packer,mgk/packer,p1-nico/packer,quantang/packer,Sheile/packer,Akasurde/packer,rrva/packer,markpeek/packer,yoctocloud/packer,life360/packer,fnoeding/packer,avldya/packer,eranchetz/packer,taliesins/packer,Akasurde/packer,dantran/packer,paulvollmer/packer,mwhooker/packer,timsutton/packer,monsterzz/packer,blairham/packer,mohae/packer,jen20/packer,ttaylor249/packer,KohlsTechnology/packer,zhuzhih2017/packer,evertrue/packer,boumenot/packer,mansunkuo/packer,fnoeding/packer,rodm/packer,jamesleech/packer,vtolstov/packer,noplay/packer,kpettijohn/packer,routelastresort/packer,routelastresort/packer,threatstream/packer,aneeshusa/packer,mkuzmin/packer,bryson/packer,danschaffer/packer,masbog/packer,sgirones/packer,leroux/packer,ricardclau/packer,mayflower/packer,jmptrader/packer,mayflower/packer,jae2/packer,monkeylittleinc/packer,pecigonzalo/packer,rnaveiras/packer,masbog/packer,styro/packer,AlphaStaxLLC/packer,avldya/packer,sobrinho/packer,grubernaut/packer,pearkes/packer,visioncritical/packer,gbarberi/packer,arizvisa/packer,jgkim/packer,hazelesque/packer,Xiol/packer,gildas/packer-hyperv,smaato/packer,pearkes/packer,pecigonzalo/packer,trumant/packer,orivej/packer,KFishner/packer,rk295/packer,samdunne/packer,jarl-dk/packer,p1-nico/packer,threatstream/packer,ricardclau/packer,pvandervelde/packer,taliesins/packer,pvanbuijtene/packer,grange74/packer,pvanbuijtene/packer,hashicorp/packer,mafrosis/packer,jmptrader/packer,youhong316/packer,tb3088/packer,mansunkuo/packer,Silver90/packer,yoctocloud/packer,zhuzhih2017/packer,mvanholsteijn/packer,boumenot/packer,taliesins/packer,tas50/packer,yonglehou/packer,noplay/packer,tomwilkie/packer,beni55/packer,dave2/packer,hazelesque/packer,KohlsTechnology/packer,bensojona/packer,Xiol/packer,Akasurde/packer,samdunne/packer,routelastresort/packer,jae2/packer,sansb/packer,tb3088/packer,lantrix/packer,rnaveiras/packer,jgkim/packer,sequenceiq/packer,sean-/packer,timsutton/packer,Cbeck527/packer,aneeshusa/packer,ephemeralsnow/packer,paulvollmer/packer,ldejager/packer,jonathankarsh/packer,pvanbuijtene/packer,c22/packer,samdunne/packer,yonglehou/packer,ephemeralsnow/packer,jonathankarsh/packer,zeliff/packer,Silver90/packer,icnocop/packer,dave2/packer,ChrisLundquist/packer,sean-/packer,monkeylittleinc/packer,dev-head/packer,mvanholsteijn/packer,pvandervelde/packer,icnocop/packer,paulmey/packer,hazelesque/packer,LinusU/packer,rk295/packer,feateds/packer,rnaveiras/packer,bradparks/packer__create_vm_for_aws_docker_vagrant_etc,quantang/packer,timsutton/packer,tomwilkie/packer,tas50/packer,btd/packer,paulmey/packer,atlassian/packer,youhong316/packer,sneal/packer,routelastresort/packer,pecigonzalo/packer,c22/packer,paulmey/packer,jen20/packer