add pull request number to CHANGES.rst
add pull request number to CHANGES.rst

pllim/astropy,aleksandr-bakanov/astropy,lpsinger/astropy,joergdietrich/astropy,MSeifert04/astropy,dhomeier/astropy,joergdietrich/astropy,AustereCuriosity/astropy,DougBurke/astropy,StuartLittlefair/astropy,astropy/astropy,aleksandr-bakanov/astropy,lpsinger/astropy,AustereCuriosity/astropy,StuartLittlefair/astropy,pllim/astropy,kelle/astropy,pllim/astropy,StuartLittlefair/astropy,kelle/astropy,kelle/astropy,dhomeier/astropy,mhvk/astropy,tbabej/astropy,astropy/astropy,larrybradley/astropy,astropy/astropy,tbabej/astropy,funbaker/astropy,lpsinger/astropy,joergdietrich/astropy,dhomeier/astropy,funbaker/astropy,mhvk/astropy,pllim/astropy,pllim/astropy,larrybradley/astropy,bsipocz/astropy,dhomeier/astropy,MSeifert04/astropy,AustereCuriosity/astropy,joergdietrich/astropy,bsipocz/astropy,MSeifert04/astropy,StuartLittlefair/astropy,lpsinger/astropy,stargaser/astropy,DougBurke/astropy,funbaker/astropy,astropy/astropy,mhvk/astropy,tbabej/astropy,tbabej/astropy,larrybradley/astropy,saimn/astropy,stargaser/astropy,AustereCuriosity/astropy,aleksandr-bakanov/astropy,DougBurke/astropy,stargaser/astropy,larrybradley/astropy,lpsinger/astropy,saimn/astropy,astropy/astropy,saimn/astropy,dhomeier/astropy,stargaser/astropy,DougBurke/astropy,mhvk/astropy,mhvk/astropy,larrybradley/astropy,bsipocz/astropy,aleksandr-bakanov/astropy,kelle/astropy,saimn/astropy,bsipocz/astropy,tbabej/astropy,kelle/astropy,joergdietrich/astropy,funbaker/astropy,saimn/astropy,MSeifert04/astropy,AustereCuriosity/astropy,StuartLittlefair/astropy