Add v7.8.6 to CHANGELOG.md [skip ci]
Add v7.8.6 to CHANGELOG.md [skip ci]

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