Merge pull request #3353 from alphagov/dependabot/bundler/minitest-5.11.2

Bump minitest from 5.11.1 to 5.11.2

Author: thomasleese

Gemfile.lock

@@ -134,7 +134,7 @@ GEM
     mime-types-data (3.2016.0521)
     mini_mime (1.0.0)
     mini_portile2 (2.3.0)
-    minitest (5.11.1)
+    minitest (5.11.2)
     minitest-focus (1.1.2)
       minitest (>= 4, < 6)
     mocha (1.3.0)