Bump rexml from 3.2.6 to 3.2.8

Bumps [rexml](https://github.com/ruby/rexml) from 3.2.6 to 3.2.8. - [Release notes](https://github.com/ruby/rexml/releases) - [Changelog](https://github.com/ruby/rexml/blob/master/NEWS.md) - [Commits](ruby/rexml@v3.2.6...v3.2.8) --- updated-dependencies: - dependency-name: rexml dependency-type: indirect ... Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Gemfile.lock

@@ -251,7 +251,8 @@ GEM
 rb-fsevent (0.11.2)
 rb-inotify (0.10.1)
 ffi (~>1.0)
-rexml (3.2.6)
+rexml (3.2.8)
+strscan (>=3.0.9)
 rouge (3.30.0)
 ruby2_keywords (0.0.5)
 rubyzip (2.3.2)
@@ -266,6 +267,7 @@ GEM
 faraday (>=0.17.3, <3)
 simpleidn (0.2.1)
 unf (~>0.1.4)
+strscan (3.1.0)
 terminal-table (1.8.0)
 unicode-display_width (~>1.1, >=1.1.1)
 typhoeus (1.4.1)