build(deps): bump codecov from 0.2.7 to 0.2.8 in /Library/Homebrew

Bumps [codecov](https://github.com/codecov/codecov-ruby) from 0.2.7 to 0.2.8.
- [Release notes](https://github.com/codecov/codecov-ruby/releases)
- [Changelog](https://github.com/codecov/codecov-ruby/blob/master/CHANGELOG.md)
- [Commits](https://github.com/codecov/codecov-ruby/compare/v0.2.7...v0.2.8)

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

Library/Homebrew/Gemfile.lock

@@ -10,12 +10,10 @@ GEM
     ast (2.4.1)
     bindata (2.4.8)
     byebug (11.1.3)
-    codecov (0.2.7)
-      colorize
+    codecov (0.2.8)
       json
       simplecov
     coderay (1.1.3)
-    colorize (0.8.1)
     commander (4.5.2)
       highline (~> 2.0.0)
     concurrent-ruby (1.1.7)