Bitbucket API errors are not visible

[ebuildy]

On method Strategy.prototype.userProfile, we lost error reason because:

if (err) {
      if (!(err instanceof Error)) {
        return done(new Error('Failed to fetch user profile'));
      }
      return done(new InternalOAuthError('Failed to fetch user profile', err));
    }

Whereas error could contain helpful information:

{"error": {
"message": "Your credentials lack one or more required privilege scopes.", 
"detail": {"granted": ["webhook", "project", "team", "email"], 
"required": ["account"]}}
}