[Security] Bump debug from 2.6.8 to 2.6.9 (#17)

Bumps [debug](https://github.com/visionmedia/debug) from 2.6.8 to 2.6.9. **This update includes security fixes.**
- [Release notes](https://github.com/visionmedia/debug/releases)
- [Changelog](https://github.com/visionmedia/debug/blob/2.6.9/CHANGELOG.md)
- [Commits](debug-js/debug@2.6.8...2.6.9)

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

Author: dependabot-preview[bot]

yarn.lock

@@ -1516,13 +1516,7 @@ date-now@^0.1.4:
   version "0.1.4"
   resolved "https://registry.yarnpkg.com/date-now/-/date-now-0.1.4.tgz#eaf439fd4d4848ad74e5cc7dbef200672b9e345b"
 
-debug@^2.1.1, debug@^2.2.0, debug@^2.6.3:
-  version "2.6.8"
-  resolved "https://registry.yarnpkg.com/debug/-/debug-2.6.8.tgz#e731531ca2ede27d188222427da17821d68ff4fc"
-  dependencies:
-    ms "2.0.0"
-
-debug@^2.6.8:
+debug@^2.1.1, debug@^2.2.0, debug@^2.6.3, debug@^2.6.8:
   version "2.6.9"
   resolved "https://registry.yarnpkg.com/debug/-/debug-2.6.9.tgz#5d128515df134ff327e90a4c93f4e077a536341f"
   dependencies: