Show user avatar for git-gateway backend as well.

src/backends/git-gateway/implementation.js

@@ -62,6 +62,7 @@ export default class GitGateway extends GitHubBackend {
         const userData = {
           name: user.user_metadata.name || user.email.split('@').shift(),
           email: user.email,
+          avatar_url: user.user_metadata.avatar_url,
           metadata: user.user_metadata,
         };
         this.api = new API({