删除无用文件

mobile/cn/release/output-metadata.json

-{
-  "version": 2,
-  "artifactType": {
-    "type": "APK",
-    "kind": "Directory"
-  },
-  "applicationId": "cn.garymb.ygomobile",
-  "variantName": "cnRelease",
-  "elements": [
-    {
-      "type": "SINGLE",
-      "filters": [],
-      "versionCode": 380800907,
-      "versionName": "3.8.8",
-      "outputFile": "mobile-cn-release.apk"
-    }
-  ]
-}
\ No newline at end of file