chore(package): update del-cli to version 3.0.0

Closes #53

Author: greenkeeper[bot]

package.json

@@ -25,7 +25,7 @@
     "@types/jest": "^23.3.9",
     "@types/supertest": "^2.0.6",
     "coveralls": "^3.0.0",
-    "del-cli": "^1.1.0",
+    "del-cli": "^3.0.0",
     "dotenv": "^6.1.0",
     "jest": "^23.6.0",
     "nodemon": "^1.18.5",