build(deps): bump rexml from 3.3.9 to 3.4.2 (#82)

Author: dependabot[bot]

Gemfile.lock

@@ -82,7 +82,7 @@ GEM
     rb-inotify (0.11.1)
       ffi (~> 1.0)
     redcarpet (3.6.1)
-    rexml (3.3.9)
+    rexml (3.4.2)
     rouge (3.30.0)
     safe_yaml (1.0.5)
     sass (3.7.4)