fix: link types in package.json exports

[NicoVogel]

Pull Request Template

Description

Fix Typescript moduleResolution Bundler error in combination with strict true.

Fixes #236

Type of change

Please delete options that are not relevant.

• [x] Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes.

• checkout repo that reproduces the error: https://github.com/NicoVogel/react-intl-universal-module-resolution-bundler
• install packages
• change the package.json from react-intl-universal in node_modules to include the types entry in the package.json exports declaration.
• see that the error is gone.

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[cwtuan]

Released in react-intl-universal@2.8.0