Add "since" column for LANGUAGE extensions in user guide
Add "since" column for LANGUAGE extensions in user guide

Reviewers: austin

Reviewed By: austin

Subscribers: thomie, bgamari

Differential Revision: https://phabricator.haskell.org/D1019

GHC Trac Issues: #9665

gridaphobe/ghc,mettekou/ghc,olsner/ghc,AlexanderPankiv/ghc,AlexanderPankiv/ghc,da-x/ghc,mfine/ghc,vTurbine/ghc,mcschroeder/ghc,snoyberg/ghc,ml9951/ghc,TomMD/ghc,ghc-android/ghc,elieux/ghc,GaloisInc/halvm-ghc,acowley/ghc,vTurbine/ghc,sgillespie/ghc,shlevy/ghc,da-x/ghc,GaloisInc/halvm-ghc,mfine/ghc,GaloisInc/halvm-ghc,vikraman/ghc,oldmanmike/ghc,acowley/ghc,wxwxwwxxx/ghc,mettekou/ghc,snoyberg/ghc,ghc-android/ghc,ezyang/ghc,AlexanderPankiv/ghc,GaloisInc/halvm-ghc,elieux/ghc,mcschroeder/ghc,shlevy/ghc,ezyang/ghc,urbanslug/ghc,siddhanathan/ghc,olsner/ghc,nkaretnikov/ghc,wxwxwwxxx/ghc,olsner/ghc,vikraman/ghc,vikraman/ghc,snoyberg/ghc,elieux/ghc,tjakway/ghcjvm,acowley/ghc,shlevy/ghc,siddhanathan/ghc,AlexanderPankiv/ghc,ezyang/ghc,sdiehl/ghc,nkaretnikov/ghc,anton-dessiatov/ghc,urbanslug/ghc,da-x/ghc,olsner/ghc,nkaretnikov/ghc,nushio3/ghc,AlexanderPankiv/ghc,urbanslug/ghc,nushio3/ghc,sgillespie/ghc,sdiehl/ghc,elieux/ghc,ghc-android/ghc,olsner/ghc,tjakway/ghcjvm,siddhanathan/ghc,nushio3/ghc,ezyang/ghc,vTurbine/ghc,wxwxwwxxx/ghc,anton-dessiatov/ghc,vikraman/ghc,olsner/ghc,mfine/ghc,ml9951/ghc,elieux/ghc,tjakway/ghcjvm,nkaretnikov/ghc,mettekou/ghc,GaloisInc/halvm-ghc,ml9951/ghc,sdiehl/ghc,mcschroeder/ghc,shlevy/ghc,oldmanmike/ghc,mfine/ghc,ml9951/ghc,acowley/ghc,ghc-android/ghc,nkaretnikov/ghc,gridaphobe/ghc,da-x/ghc,urbanslug/ghc,vikraman/ghc,mfine/ghc,anton-dessiatov/ghc,da-x/ghc,siddhanathan/ghc,siddhanathan/ghc,vTurbine/ghc,sdiehl/ghc,mettekou/ghc,TomMD/ghc,gridaphobe/ghc,AlexanderPankiv/ghc,mcschroeder/ghc,nushio3/ghc,da-x/ghc,shlevy/ghc,tjakway/ghcjvm,AlexanderPankiv/ghc,acowley/ghc,tjakway/ghcjvm,da-x/ghc,TomMD/ghc,TomMD/ghc,sgillespie/ghc,sgillespie/ghc,mettekou/ghc,olsner/ghc,urbanslug/ghc,nkaretnikov/ghc,ghc-android/ghc,nkaretnikov/ghc,gridaphobe/ghc,GaloisInc/halvm-ghc,ml9951/ghc,vTurbine/ghc,mfine/ghc,anton-dessiatov/ghc,oldmanmike/ghc,siddhanathan/ghc,ezyang/ghc,sdiehl/ghc,sdiehl/ghc,GaloisInc/halvm-ghc,nushio3/ghc,shlevy/ghc,acowley/ghc,anton-dessiatov/ghc,acowley/ghc,oldmanmike/ghc,wxwxwwxxx/ghc,anton-dessiatov/ghc,sgillespie/ghc,tjakway/ghcjvm,wxwxwwxxx/ghc,gridaphobe/ghc,oldmanmike/ghc,mcschroeder/ghc,sgillespie/ghc,sgillespie/ghc,vTurbine/ghc,tjakway/ghcjvm,vikraman/ghc,mfine/ghc,ml9951/ghc,urbanslug/ghc,urbanslug/ghc,snoyberg/ghc,ezyang/ghc,TomMD/ghc,ml9951/ghc,nushio3/ghc,mettekou/ghc,TomMD/ghc,snoyberg/ghc,ghc-android/ghc,mettekou/ghc,shlevy/ghc,elieux/ghc,nushio3/ghc,elieux/ghc,anton-dessiatov/ghc,ghc-android/ghc,gridaphobe/ghc,siddhanathan/ghc,ml9951/ghc,snoyberg/ghc,vTurbine/ghc,mcschroeder/ghc,gridaphobe/ghc,wxwxwwxxx/ghc,oldmanmike/ghc,TomMD/ghc,vikraman/ghc,ezyang/ghc,mcschroeder/ghc,oldmanmike/ghc,snoyberg/ghc,sdiehl/ghc,wxwxwwxxx/ghc