sec: bump 'rexml' gem version

to 3.4.2 from 3.2.5

Author: wpramio

Gemfile.lock

@@ -12,7 +12,7 @@ GEM
     diff-lcs (1.6.2)
     forgery (0.5.0)
     rake (12.3.3)
-    rexml (3.2.5)
+    rexml (3.4.2)
     rspec (3.13.1)
       rspec-core (~> 3.13.0)
       rspec-expectations (~> 3.13.0)