chore: update main field in package.json

[ClementMindflow]

When using this plugin with node 16.2.0 , i get the following warning:

(node:64536) [DEP0128] DeprecationWarning: Invalid 'main' field in '......./eslint-plugin-react-redux/package.json' of 'dist/index.js'. Please either fix that or report it to the module author

It seems like the dist folder should be created by the build script but:

• This build script is not called in a prepublish step
• The dist folder is not part of the package shipped on npm

I guess that's a mistake, so this PR just remove the main field in package.json.
According to the node resolution algorithm, the root index.js file should be used as the module entrypoint.

In my case that fix the warning.

[ljharb]

Definitely do not remove the “main” field. Either explicitly point it at the correct location, or fix the bug that causes this location not to exist.

[ClementMindflow]

@ljharb I've restored the main field and set it to point directly to index.js.

Just curious, but why do you think it's preferable to keep the main field pointing to index.js instead of letting node resolving it by default ? For sake of explicitness ?

[ljharb]

Yes, exactly.

[ClementMindflow]

Test for version 7.x are failing, i do not think it's related to my changes as the same issue occurs on other MR created by dependabot.

I'd really like to see this MR merged but i really don't know how to fix that.

@DianaSuvorova @ljharb how can i help ? Can we merge it anyway ?