add recast as a dependency

Author: mansona

packages/ember-cli-fastboot/package.json

@@ -39,6 +39,7 @@
     "fs-extra": "^7.0.0",
     "json-stable-stringify": "^1.0.1",
     "md5-hex": "^2.0.0",
+    "recast": "^0.19.1",
     "silent-error": "^1.1.0"
   },
   "devDependencies": {