Adding mpmath and jplemphem to optional dependency list
Adding mpmath and jplemphem to optional dependency list

bsipocz/astropy,astropy/astropy,dhomeier/astropy,StuartLittlefair/astropy,larrybradley/astropy,aleksandr-bakanov/astropy,stargaser/astropy,pllim/astropy,pllim/astropy,mhvk/astropy,mhvk/astropy,larrybradley/astropy,lpsinger/astropy,StuartLittlefair/astropy,saimn/astropy,lpsinger/astropy,stargaser/astropy,StuartLittlefair/astropy,bsipocz/astropy,bsipocz/astropy,larrybradley/astropy,saimn/astropy,astropy/astropy,lpsinger/astropy,aleksandr-bakanov/astropy,astropy/astropy,dhomeier/astropy,saimn/astropy,astropy/astropy,MSeifert04/astropy,dhomeier/astropy,larrybradley/astropy,saimn/astropy,mhvk/astropy,pllim/astropy,saimn/astropy,mhvk/astropy,MSeifert04/astropy,aleksandr-bakanov/astropy,StuartLittlefair/astropy,larrybradley/astropy,dhomeier/astropy,pllim/astropy,bsipocz/astropy,MSeifert04/astropy,aleksandr-bakanov/astropy,MSeifert04/astropy,stargaser/astropy,pllim/astropy,dhomeier/astropy,StuartLittlefair/astropy,astropy/astropy,stargaser/astropy,lpsinger/astropy,lpsinger/astropy,mhvk/astropy