Merge pull request #422 from moov-io/dependabot/bundler/docs/rexml-3.3.3

build(deps): bump rexml from 3.3.2 to 3.3.3 in /docs

Author: adamdecaf

docs/Gemfile.lock

@@ -248,7 +248,7 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.11.1)
       ffi (~> 1.0)
-    rexml (3.3.2)
+    rexml (3.3.3)
       strscan
     rouge (3.30.0)
     ruby2_keywords (0.0.5)