Merge pull request #520 from ProgrammingDaisukiClub/dependabot/bundler/master/spring-2.1.1

Author: dependabot-preview[bot]

Gemfile.lock

@@ -246,7 +246,7 @@ GEM
       sprockets (> 3.0)
       sprockets-rails
       tilt
-    spring (2.1.0)
+    spring (2.1.1)
     spring-watcher-listen (2.0.1)
       listen (>= 2.7, < 4.0)
       spring (>= 1.2, < 3.0)