Merge pull request #561 from NuSkooler/dependabot/bundler/docs/rexml-3.3.6

Bump rexml from 3.2.6 to 3.3.6 in /docs

Author: NuSkooler

docs/Gemfile.lock

@@ -88,11 +88,13 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.2.6)
+    rexml (3.3.6)
+      strscan
     rouge (3.30.0)
     safe_yaml (1.0.5)
     sassc (2.4.0)
       ffi (~> 1.9)
+    strscan (3.1.0)
     terminal-table (2.0.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
     tzinfo (2.0.6)