Update changelog for 1.12.4
Update changelog for 1.12.4

AndersonFirmino/coffeescript,shreeve/coffeescript,AndersonFirmino/coffeescript,mrmowgli/coffeescript,jashkenas/coffeescript,jiangmiao/toffee-script,cosmicexplorer/coffeescript,jiangmiao/toffee-script,jiangmiao/toffee-script,xixixao/coffee-script