Add release notes for v0.2.0
Add release notes for v0.2.0

mdn/browsercompat,renoirb/browsercompat,mdn/browsercompat,renoirb/browsercompat,mdn/browsercompat,jwhitlock/web-platform-compat,jwhitlock/web-platform-compat,renoirb/browsercompat,jwhitlock/web-platform-compat