Bump rexml from 3.2.6 to 3.2.7

Bumps [rexml](https://github.com/ruby/rexml) from 3.2.6 to 3.2.7.
- [Release notes](https://github.com/ruby/rexml/releases)
- [Changelog](https://github.com/ruby/rexml/blob/master/NEWS.md)
- [Commits](ruby/rexml@v3.2.6...v3.2.7)

---
updated-dependencies:
- dependency-name: rexml
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile.lock

@@ -76,7 +76,8 @@ GEM
     redis-client (0.15.0)
       connection_pool
     regexp_parser (2.8.1)
-    rexml (3.2.6)
+    rexml (3.2.7)
+      strscan (>= 3.0.9)
     rspec (3.12.0)
       rspec-core (~> 3.12.0)
       rspec-expectations (~> 3.12.0)
@@ -127,6 +128,7 @@ GEM
       rack (~> 2.2, >= 2.2.4)
       rack-protection (= 3.1.0)
       tilt (~> 2.0)
+    strscan (3.1.0)
     tilt (2.2.0)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)