Update dependencies to enable Greenkeeper 🌴 (#37)

* chore(package): update dependencies

* docs(readme): add Greenkeeper badge

Author: greenkeeper[bot]

README.md

@@ -175,4 +175,4 @@ In lieu of a formal styleguide, take care to maintain the existing coding style.
 ## License
 Copyright (c) 2017 Andreas Pizsa (http://github.com/AndreasPizsa), contributors.  
 
-[![FOSSA Status](https://app.fossa.io/api/projects/git%2Bgithub.com%2FAndreasPizsa%2Fparse-decimal-number.svg?type=large)](https://app.fossa.io/projects/git%2Bgithub.com%2FAndreasPizsa%2Fparse-decimal-number?ref=badge_large)
+[![FOSSA Status](https://app.fossa.io/api/projects/git%2Bgithub.com%2FAndreasPizsa%2Fparse-decimal-number.svg?type=large)](https://app.fossa.io/projects/git%2Bgithub.com%2FAndreasPizsa%2Fparse-decimal-number?ref=badge_large) [![Greenkeeper badge](https://badges.greenkeeper.io/AndreasPizsa/parse-decimal-number.svg)](https://greenkeeper.io/)

package.json

@@ -42,11 +42,11 @@
   },
   "homepage": "https://github.com/AndreasPizsa/parse-decimal-number",
   "devDependencies": {
-    "cldr": "4.12.0",
+    "cldr": "4.13.0",
     "coffee-script": "1.12.7",
     "gulp": "3.9.1",
     "gulp-blanket-mocha": "0.0.4",
-    "gulp-coffee": "2.3.5",
+    "gulp-coffee": "3.0.3",
     "gulp-coveralls": "0.1.4",
     "gulp-istanbul": "1.1.3",
     "gulp-mocha": "6.0.0",