gold colour to badge

gold looks more like the yellow from the original badge

bin/boilerplate/README.md

@@ -17,7 +17,7 @@ Please see the current list of [issues][] for ideas for contributing to this
 repository. For making your contribution, we use the GitHub flow, which is
 nicely explained in the chapter [Contributing to a Project](http://git-scm.com/book/en/v2/GitHub-Contributing-to-a-Project) in Pro Git
 by Scott Chacon.
-Look for the tag ![good_first_issue](https://img.shields.io/badge/-good%20first%20issue-yellowgreen.svg). This indicates that the mantainers will welcome a pull request fixing this issue.  
+Look for the tag ![good_first_issue](https://img.shields.io/badge/-good%20first%20issue-gold.svg). This indicates that the mantainers will welcome a pull request fixing this issue.  
 
 
 ## Maintainer(s)