chore(deps): bump rexml from 3.3.5 to 3.3.6 (#237)

Author: dependabot[bot]

Gemfile.lock

@@ -77,7 +77,7 @@ GEM
     regexp_parser (2.9.2)
     reverse_markdown (2.1.1)
       nokogiri
-    rexml (3.3.5)
+    rexml (3.3.6)
       strscan
     rouge (4.3.0)
     rspec (3.13.0)