chore(deps): bump rexml from 3.2.8 to 3.3.6 (#237)

Author: thekaveman

Gemfile.lock

@@ -51,8 +51,8 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.2.8)
-      strscan (>= 3.0.9)
+    rexml (3.3.6)
+      strscan
     rouge (4.2.0)
     safe_yaml (1.0.5)
     sassc (2.4.0)