fix package.json

packages/slackbot-proxy/package.json

@@ -18,7 +18,7 @@
     "predev": "yarn cp:bootstrap:dev",
     "test": "cross-env NODE_ENV=test jest --passWithNoTests",
     "lint": "eslint src --ext .ts",
-    "lint:fix": "eslint src --ext .ts --fix",
+    "lint:fix": "eslint src --ext .ts --fix"
   },
   "// comments for dependencies": {},
   "dependencies": {