#31: updated release notes to reflect upcoming 0.5.1 release
#31: updated release notes to reflect upcoming 0.5.1 release

tachang/jjwt,dogeared/jjwt,jhericks/jjwt,reinaldohorie/jjwt,josebarrueta/jjwt,ChiralBehaviors/jjwt,brentstormpath/jjwt,jwtk/jjwt,hendrosteven/jjwt