Bump debug from 1.1.0 to 1.2.0

Bumps [debug](https://github.com/ruby/debug) from 1.1.0 to 1.2.0.
- [Release notes](https://github.com/ruby/debug/releases)
- [Commits](https://github.com/ruby/debug/compare/v1.1.0...v1.2.0)

---
updated-dependencies:
- dependency-name: debug
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Gemfile.lock

@@ -70,7 +70,7 @@ GEM
       thor (~> 1.0)
     concurrent-ruby (1.1.9)
     crass (1.0.6)
-    debug (1.1.0)
+    debug (1.2.0)
       irb
       reline (>= 0.2.7)
     diff-lcs (1.4.4)