Merge pull request #7 from coderdojo-japan/dependabot/bundler/rexml-3.4.2

Bump rexml from 3.4.1 to 3.4.2

Author: yasulab

Gemfile.lock

@@ -146,7 +146,7 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.11.1)
       ffi (~> 1.0)
-    rexml (3.4.1)
+    rexml (3.4.2)
     rouge (4.5.2)
     ruby-rc4 (0.1.5)
     safe_yaml (1.0.5)