Add 3.0.3 to changelog
Add 3.0.3 to changelog

kappezoro/sprockets,sferik/sprockets,prusswan/sprockets,Andreis13/sprockets,masarakki/sprockets,JuanitoFatas/sprockets,maclover7/sprockets,orlando/sprockets,eileencodes/sprockets,jcoyne/sprockets,byroot/sprockets,guilleiguaran/sprockets,askl56/sprockets,rails/sprockets,bdezonia/sprockets,basecamp/sprockets,daniel-rikowski/sprockets,prathamesh-sonpatki/sprockets,jeremy/sprockets,recursecenter/sprockets