remove unused changelog sections/add 1.0.8
remove unused changelog sections/add 1.0.8

[ci skip]

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