fix(package): update chalk to version 4.0.0

Closes #77

Author: greenkeeper[bot]

package.json

@@ -54,7 +54,7 @@
     "codecov": "nyc report --reporter=text-lcov > coverage.lcov && codecov"
   },
   "dependencies": {
-    "chalk": "^2.3.2",
+    "chalk": "^4.0.0",
     "express": "^4.16.3",
     "moment": "^2.21.0",
     "qs": "^6.5.1",