Update coffee-script requirement from 1.6.3 to 1.12.7

Updates the requirements on [coffee-script](https://github.com/jashkenas/coffeescript) to permit the latest version.
- [Release notes](https://github.com/jashkenas/coffeescript/releases)
- [Commits](jashkenas/coffeescript@1.6.3...1.12.7)

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

Author: dependabot-preview[bot]

package.json

@@ -13,7 +13,7 @@
   },
   "dependencies": {},
   "devDependencies": {
-    "coffee-script": "1.6.3",
+    "coffee-script": "1.12.7",
     "mocha": "1.11.0",
     "chai": "1.7.1",
     "curl-trace-parser": ""