Merge pull request #1757 from firebase/dpebot-repositorygardener

Auto-update dependencies.

Author: ncooke3

Gemfile.lock

@@ -90,7 +90,7 @@ GEM
     netrc (0.11.0)
     nkf (0.2.0)
     public_suffix (4.0.7)
-    rexml (3.4.2)
+    rexml (3.4.3)
     ruby-macho (2.5.1)
     securerandom (0.3.2)
     typhoeus (1.4.1)