Bump bitters from 1.2.0 to 2.0.3

Bumps [bitters](https://github.com/thoughtbot/bitters) from 1.2.0 to 2.0.3.
- [Release notes](https://github.com/thoughtbot/bitters/releases)
- [Changelog](https://github.com/thoughtbot/bitters/blob/master/CHANGELOG.md)
- [Commits](thoughtbot/bitters@v1.2.0...v2.0.3)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

Gemfile.lock

@@ -115,10 +115,8 @@ GEM
       activerecord (>= 4.0.0, < 5)
     babosa (1.0.2)
     bcrypt (3.1.12)
-    bitters (1.2.0)
-      bourbon (>= 4.2)
-      sass (>= 3.4)
-      thor
+    bitters (2.0.3)
+      thor (~> 0.19)
     bourbon (4.3.4)
       sass (~> 3.4)
       thor (~> 0.19)