Merge pull request #50 from apache/dependabot/bundler/rexml-3.4.2

Bump rexml from 3.3.9 to 3.4.2
diff --git a/Gemfile.lock b/Gemfile.lock
index 5f26473..d670440 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -48,7 +48,7 @@
     rb-fsevent (0.11.0)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.3.9)
+    rexml (3.4.2)
     rouge (3.26.0)
     safe_yaml (1.0.5)
     sass (3.7.4)