Bump github-markup from 3.0.1 to 3.0.2 (#1350)

Bumps [github-markup](https://github.com/github/markup) from 3.0.1 to 3.0.2.
- [Release notes](https://github.com/github/markup/releases)
- [Changelog](https://github.com/github/markup/blob/master/HISTORY.md)
- [Commits](https://github.com/github/markup/compare/v3.0.1...v3.0.2)

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

Gemfile.lock

@@ -118,7 +118,7 @@ GEM
     gemoji (3.0.0)
     get_process_mem (0.2.3)
     git (1.5.0)
-    github-markup (3.0.1)
+    github-markup (3.0.2)
     globalid (0.4.1)
       activesupport (>= 4.2.0)
     guard (2.15.0)