Bump coffee-script from 1.6.3 to 1.12.7

Bumps [coffee-script](https://github.com/jashkenas/coffeescript) from 1.6.3 to 1.12.7.
- [Release notes](https://github.com/jashkenas/coffeescript/releases)
- [Commits](jashkenas/coffeescript@1.6.3...1.12.7)

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

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

package.json

@@ -32,7 +32,7 @@
   },
   "devDependencies": {
     "chai": "~1.8.1",
-    "coffee-script": "~1.6.3",
+    "coffee-script": "~1.12.7",
     "grunt": "~0.4.1",
     "grunt-cli": "~0.1.11",
     "grunt-coffeelint": "~0.0.7",