Merge pull request #26 from coderdojo-japan/dependabot/bundler/rexml-3.3.6

Bump rexml from 3.3.2 to 3.3.6

Author: yasulab

Gemfile.lock

@@ -102,7 +102,7 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.11.1)
       ffi (~> 1.0)
-    rexml (3.3.2)
+    rexml (3.3.6)
       strscan
     rouge (4.3.0)
     ruby-rc4 (0.1.5)