🤖 chore: Add cover key in .babel.env.

These changes were automatically generated by a transform whose code can be found at:
  - https://github.com/aureooms/rejuvenate/blob/c0306a0431f42510000cc745a99bc61ad7710a7a/src/transforms/package.json:ensure-babel-env-cover.js
Please contact the author of the transform if you believe there was an error.

Author: a-flying-potato

package.json

@@ -175,7 +175,8 @@
             }
           ]
         ]
-      }
+      },
+      "cover": {}
     }
   },
   "lint-staged": {