Merge pull request #14 from oreillymedia/dependabot/bundler/rexml-3.3.9

Bump rexml from 3.3.6 to 3.3.9

Author: ruralocity

Gemfile.lock

@@ -22,8 +22,7 @@ GEM
     hashie (3.6.0)
     public_suffix (5.0.0)
     rake (13.0.6)
-    rexml (3.3.6)
-      strscan
+    rexml (3.3.9)
     rspec (3.12.0)
       rspec-core (~> 3.12.0)
       rspec-expectations (~> 3.12.0)
@@ -44,7 +43,6 @@ GEM
       simplecov_json_formatter (~> 0.1)
     simplecov-html (0.12.3)
     simplecov_json_formatter (0.1.4)
-    strscan (3.1.0)
     webmock (3.18.1)
       addressable (>= 2.8.0)
       crack (>= 0.3.2)