chore(deps): update dependency del-cli to v6

Author: renovate[bot]

package.json

@@ -40,7 +40,7 @@
   "devDependencies": {
     "@smartive/tslint-config": "^7.0.1",
     "@types/jest": "^24.0.17",
-    "del-cli": "^2.0.0",
+    "del-cli": "^6.0.0",
     "jest": "^24.8.0",
     "semantic-release": "^15.13.18",
     "ts-jest": "^24.0.2",