Add babel eslint plugin
Add babel eslint plugin

As our linter has been failing because it needs it

vector-im/riot-web,vector-im/riot-web,martindale/vector,vector-im/vector-web,vector-im/vector-web,vector-im/riot-web,vector-im/vector-web,martindale/vector,vector-im/riot-web,vector-im/vector-web,vector-im/riot-web,vector-im/vector-web,vector-im/riot-web