fix(package): update chalk to version 2.4.1

Closes #27

Author: greenkeeper[bot]

package.json

@@ -48,7 +48,7 @@
         "npm": "5.4.2"
     },
     "dependencies": {
-        "chalk": "2.3.0",
+        "chalk": "2.4.1",
         "minimist": "1.2.0"
     },
     "devDependencies": {