Merge pull request #317 from nightscout/dependabot/bundler/rexml-3.3.9

Bump rexml from 3.3.6 to 3.3.9

Author: dhermanns

Gemfile.lock

@@ -172,8 +172,7 @@ GEM
       trailblazer-option (>= 0.1.1, < 0.2.0)
       uber (< 0.2.0)
     retriable (3.1.2)
-    rexml (3.3.6)
-      strscan
+    rexml (3.3.9)
     rouge (2.0.7)
     ruby2_keywords (0.0.5)
     rubyzip (2.3.2)
@@ -186,7 +185,6 @@ GEM
     simctl (1.6.10)
       CFPropertyList
       naturally
-    strscan (3.1.0)
     terminal-notifier (2.0.0)
     terminal-table (3.0.2)
       unicode-display_width (>= 1.1.1, < 3)