Merge pull request #831 from Parallel-in-Time/dependabot/bundler/rexml-3.3.3

Bump rexml from 3.3.0 to 3.3.3

Author: pancetta

Gemfile.lock

@@ -100,7 +100,7 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.3.0)
+    rexml (3.3.3)
       strscan
     rouge (4.1.3)
     safe_yaml (1.0.5)