fix(package): update chalk to version 2.0.0

Author: greenkeeper[bot]

package.json

@@ -38,7 +38,7 @@
     "@reactivex/rxjs": "^5.3.0",
     "chai": "^4.0.1",
     "chai-as-promised": "^7.0.0",
-    "chalk": "^1.1.3",
+    "chalk": "^2.0.0",
     "commander": "^2.9.0",
     "fast-json-patch": "^2.0.2",
     "glob": "^7.1.1",