Add real main path to package.json

[jamesvillarrubia]

Node 20 will refuse to run bin commands if main does not reference a real file or directory.

For example:

node:internal/modules/esm/resolve:189
  const resolvedOption = FSLegacyMainResolve(packageJsonUrlString, packageConfig.main, baseStringified);
                         ^

Error: Cannot find package '/Users/james/foas/node_modules/openapi-merger/package.json' imported from /Users/james/foas/bin/bin.js
    at legacyMainResolve (node:internal/modules/esm/resolve:189:26)
    at packageResolve (node:internal/modules/esm/resolve:776:14)
    at moduleResolve (node:internal/modules/esm/resolve:838:20)
    at defaultResolve (node:internal/modules/esm/resolve:1043:11)
    at ModuleLoader.defaultResolve (node:internal/modules/esm/loader:383:12)
    at ModuleLoader.resolve (node:internal/modules/esm/loader:352:25)
    at ModuleLoader.getModuleJob (node:internal/modules/esm/loader:228:38)
    at ModuleWrap.<anonymous> (node:internal/modules/esm/module_job:85:39)
    at link (node:internal/modules/esm/module_job:84:36) {
  code: 'ERR_MODULE_NOT_FOUND'
}

[sonarcloud[bot]]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[kota65535]

@jamesvillarrubia Thank you for contribution!