Bump rexml from 3.2.5 to 3.2.8

Bumps [rexml](https://github.com/ruby/rexml) from 3.2.5 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@v3.2.5...v3.2.8)

---
updated-dependencies:
- dependency-name: rexml
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Gemfile.lock

@@ -60,7 +60,8 @@ GEM
     rb-fsevent (0.11.1)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.2.5)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     rouge (3.28.0)
     ruby_dep (1.3.1)
     safe_yaml (1.0.5)
@@ -70,6 +71,7 @@ GEM
       rack (> 1, < 3)
     sprockets-helpers (1.4.0)
       sprockets (>= 2.2)
+    strscan (3.1.0)
     tilt (2.0.10)
     uglifier (2.7.2)
       execjs (>= 0.3.0)