Merge pull request #739 from digitalronin/master

Add "standard" ruby linter

Author: kenyonj

collections/clean-code-linters/index.md

@@ -22,6 +22,7 @@ items:
  - rodjek/puppet-lint
  - koalaman/shellcheck
  - jimhester/lintr
+ - testdouble/standard
 display_name: Clean code linters
 created_by: holman
 ---