message: Meta: Add test for feature screenshot
diff: @@ -60,6 +60,10 @@ function findError(filename: string): string | void {
  return `ERR: ${featureId} should be described better in the readme (at least 20 characters)`;
  }
  + if (featureMeta.screenshot && !/\.(png|gif)$/.test(featureMeta.screenshot)) {
  + return `ERR: ${featureId} should have a screenshot (png/gif) in the readme`;
  + }
  +
  if (duplicate) {
  return `ERR: ${featureId} should be described only once in the readme`;
  }
  