chore(deps): pin dependency @babel/cli to 7.6.4

Author: renovate-bot

sample/09-babel-example/package.json

@@ -22,7 +22,7 @@
     "rxjs": "6.5.3"
   },
   "devDependencies": {
-    "@babel/cli": "^7.6.4",
+    "@babel/cli": "7.6.4",
     "@babel/core": "7.6.4",
     "@babel/node": "7.6.3",
     "@babel/plugin-proposal-decorators": "7.6.0",