Merge pull request #53 from ruby-jp/dependabot/bundler/rexml-3.4.2

Author: yuemori

Gemfile.lock

@@ -233,7 +233,7 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.11.1)
       ffi (~> 1.0)
-    rexml (3.4.1)
+    rexml (3.4.2)
     rouge (3.26.0)
     rubyzip (2.4.1)
     safe_yaml (1.0.5)