add missing package chalk

Author: Agnes Lin

package.json

@@ -22,6 +22,7 @@
   "dependencies": {
     "async": "^0.9.0",
     "bluebird": "^3.4.6",
+    "chalk": "^3.0.0",
     "debug": "^4.1.1",
     "loopback-connector": "^4.2.2",
     "pg": "^7.0.0",