chore: fix a typo in module field in package.json

[alirezamirian]

Fixes webpack build problem

[alirezamirian]

Also note that module in package.json should point to an entry file which uses ESM, but should not use other non ES5 features like class. This causes problems when building with popular build tools like webpack. I suggest removing the module entry in package.json altogether, or transpile it to ES5.

More info:

webpack/webpack#1979 (comment)

and also from webpack docs:

The module property should point to a script that utilizes ES2015 module syntax but no other syntax features that aren't yet supported by browsers or node. This enables webpack to parse the module syntax itself, allowing for lighter bundles via tree shaking if users are only consuming certain parts of the library.

[ilyashubin]

Thanks! I will remove module in the next version 👍