Merge pull request #123 from github/dependabot/bundler/minitest-5.21.2

Bump minitest from 5.21.1 to 5.21.2

Author: github-actions[bot]

Gemfile.lock

@@ -44,7 +44,7 @@ GEM
       crass (~> 1.0.2)
       nokogiri (>= 1.12.0)
     mini_portile2 (2.8.4)
-    minitest (5.21.1)
+    minitest (5.21.2)
     mocha (2.1.0)
       ruby2_keywords (>= 0.0.5)
     nokogiri (1.15.4)