fix(package): update chalk to version 4.0.0

Closes #63

Author: greenkeeper[bot]

package.json

@@ -24,7 +24,7 @@
   "author": "Wolf T. Mathes",
   "license": "MIT",
   "dependencies": {
-    "chalk": "^2.0.1",
+    "chalk": "^4.0.0",
     "commander": "^4.0.0",
     "deep-assign": "^3.0.0",
     "fallback-cli": "^2.0.2",