Merge pull request #77 from igraph/dependabot/bundler/rexml-3.4.2

Author: ntamas

Gemfile.lock

@@ -69,7 +69,7 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.11.1)
       ffi (~> 1.0)
-    rexml (3.4.1)
+    rexml (3.4.2)
     rouge (4.5.1)
     safe_yaml (1.0.5)
     sass-embedded (1.69.5)