Merge pull request cs231n#270 from cs231n/dependabot/bundler/rexml-3.2.5

Bump rexml from 3.2.3.1 to 3.2.5

Author: ranjaykrishna

Gemfile.lock

@@ -48,7 +48,7 @@ GEM
     rb-fsevent (0.11.0)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.2.3.1)
+    rexml (3.2.5)
     rouge (3.26.0)
     safe_yaml (1.0.5)
     sassc (2.4.0)