Bump codecov from 0.2.2 to 0.2.3

Bumps [codecov](https://github.com/codecov/codecov-ruby) from 0.2.2 to 0.2.3.
- [Release notes](https://github.com/codecov/codecov-ruby/releases)
- [Changelog](https://github.com/codecov/codecov-ruby/blob/master/CHANGELOG.md)
- [Commits](codecov/codecov-ruby@v0.2.2...v0.2.3)

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

Gemfile.lock

@@ -88,7 +88,7 @@ GEM
     childprocess (3.0.0)
     chrome_remote (0.3.0)
       websocket-driver (~> 0.6)
-    codecov (0.2.2)
+    codecov (0.2.3)
       colorize
       json
       simplecov