Merge pull request #988 from Parallel-in-Time/dependabot/bundler/rexml-3.4.2

Bump rexml from 3.3.9 to 3.4.2

Author: tlunet

Gemfile.lock

@@ -104,7 +104,7 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.3.9)
+    rexml (3.4.2)
     rouge (4.1.3)
     safe_yaml (1.0.5)
     sass (3.7.4)