Merge pull request #662 from scala-js/dependabot/bundler/rexml-3.4.2

Bump rexml from 3.3.9 to 3.4.2

Author: sjrd

Gemfile.lock

@@ -60,7 +60,7 @@ GEM
     rb-fsevent (0.11.1)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.3.9)
+    rexml (3.4.2)
     rouge (3.28.0)
     ruby_dep (1.3.1)
     safe_yaml (1.0.5)