Add v7.7.6 to CHANGELOG.md [skip ci]
Add v7.7.6 to CHANGELOG.md [skip ci]

jridgewell/babel,hzoo/babel,jridgewell/babel,kaicataldo/babel,hzoo/babel,kaicataldo/babel,babel/babel,babel/babel,kaicataldo/babel,hzoo/babel,babel/babel,jridgewell/babel,hzoo/babel,babel/babel,jridgewell/babel,kaicataldo/babel