Merge pull request #181 from OpenPrinting/dependabot/bundler/rexml-3.4.2

Bump rexml from 3.4.1 to 3.4.2

Author: zdohnal

Gemfile.lock

@@ -277,7 +277,7 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.11.1)
       ffi (~> 1.0)
-    rexml (3.4.1)
+    rexml (3.4.2)
     rouge (3.30.0)
     rubyzip (2.4.1)
     safe_yaml (1.0.5)