Bump highline from 2.0.2 to 2.0.3

Bumps [highline](https://github.com/JEG2/highline) from 2.0.2 to 2.0.3.
- [Release notes](https://github.com/JEG2/highline/releases)
- [Changelog](https://github.com/JEG2/highline/blob/master/Changelog.md)
- [Commits](JEG2/highline@v2.0.2...v2.0.3)

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

Gemfile.lock

@@ -118,7 +118,7 @@ GEM
       activesupport (>= 4.2.0)
     hashdiff (1.0.0)
     hashie (3.6.0)
-    highline (2.0.2)
+    highline (2.0.3)
     http (3.3.0)
       addressable (~> 2.3)
       http-cookie (~> 1.0)