Update base changelog regarding 4.8.1 changes
Update base changelog regarding 4.8.1 changes

Turns out we've been a bit too lazy and quite a few undocumented changes have
accumulated in `base` relative to GHC 7.10's `base-4.8.0.0`...

[skip ci]

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