Merge pull request #98 from ruby-syntax-tree/dependabot/bundler/minitest-5.16.0

Bump minitest from 5.15.0 to 5.16.0

Author: github-actions[bot]

Gemfile.lock

@@ -9,7 +9,7 @@ GEM
   specs:
     ast (2.4.2)
     docile (1.4.0)
-    minitest (5.15.0)
+    minitest (5.16.0)
     parallel (1.22.1)
     parser (3.1.2.0)
       ast (~> 2.4.1)