🤖 chore: Add cover key in .babel.env.

These changes were automatically generated by a transform whose code can be found at:
  - https://github.com/make-github-pseudonymous-again/rejuvenate/blob/1b5252aec880aa76850f97b16980a6ce00c782c4/src/transforms/package.json:ensure-babel-env-cover.js
Please contact the author of the transform if you believe there was an error.

package.json

@@ -103,6 +103,7 @@
       ]
     ],
     "env": {
+      "cover": {},
       "development": {
         "sourceMaps": "inline"
       }