Update TYPESCRIPT.md

[simonhaenisch]

Description

The type declarations for this plugin come with the package now, @types/phonegap-plugin-push has been deprecated.

The example also didn't show how to actually import the types.

Related Issue

Nope.

Motivation and Context

I needed to use this plugin in a Typescript project and saw that this doc was outdated.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[fredgalvao]

Thanks for your time and for the contribution!

[fredgalvao]

#2297 and #1536 have been the target issue for a while, and I'll link this here for consistency.

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