Add release notes for Fitness 0.0.3
Add release notes for Fitness 0.0.3

@collinjackson

tvolkert/flutter,Hixie/flutter,turnidge/flutter,turnidge/flutter,cbracken/flutter,tvolkert/flutter,flutter/flutter,Hixie/flutter,turnidge/flutter,flutter/flutter,tvolkert/flutter,tvolkert/flutter,Hixie/flutter,tvolkert/flutter,cbracken/flutter,jason-simmons/flutter,tvolkert/flutter,cbracken/flutter,cbracken/flutter,flutter/flutter,cbracken/flutter,aghassemi/flutter,turnidge/flutter,flutter/flutter,cbracken/flutter,aghassemi/flutter,aghassemi/flutter,tvolkert/flutter,jason-simmons/flutter,flutter/flutter,cbracken/flutter,Hixie/flutter,aghassemi/flutter,Hixie/flutter,tvolkert/flutter,Hixie/flutter,cbracken/flutter,flutter/flutter,flutter/flutter,Hixie/flutter,flutter/flutter,Hixie/flutter,tvolkert/flutter,Hixie/flutter,jason-simmons/flutter,turnidge/flutter,jason-simmons/flutter,cbracken/flutter,flutter/flutter,Hixie/flutter,tvolkert/flutter,flutter/flutter,cbracken/flutter