Update changelog for 2.2.1
Update changelog for 2.2.1

nambrot/jbuilder,suryasnath/Venture,odedniv/jbuilder,vincentwoo/jbuilder,ASnow/jbuilder,rails/jbuilder,jasnow/jbuilder,maclover7/jbuilder,sue445/jbuilder,WellframeInc/jbuilder