Merge pull request #143 from sakusaku3939/dependabot/bundler/rexml-3.4.2

Bump rexml from 3.3.9 to 3.4.2

Author: sakusaku3939

Gemfile.lock

@@ -156,7 +156,7 @@ GEM
       trailblazer-option (>= 0.1.1, < 0.2.0)
       uber (< 0.2.0)
     retriable (3.1.2)
-    rexml (3.3.9)
+    rexml (3.4.2)
     rouge (2.0.7)
     ruby2_keywords (0.0.4)
     rubyzip (2.3.0)