Update cli to alpha 4

Author: LoicPoullain

generators/app/templates/package.json

@@ -32,7 +32,7 @@
   },
   "devDependencies": {
     "@types/node": "^8.0.47",
-    "@foal/cli": "^0.5.0-alpha.2",
+    "@foal/cli": "^0.5.0-alpha.4",
     "chai": "^4.1.2",
     "@types/chai": "^4.1.3",
     "mocha": "^5.2.0",