Missing method typings for OverlayPanel

[APalaitis]

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[x ] bug report
[ ] feature request
[ ] support request 

Codesandbox Case (Bug Reports)
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Current behavior Typescript errors when using hide()/show() methods of OverlayPanel. The methods are described in the documentation and work when used if typing errors are ignored.

Expected behavior no Typescript errors.

Minimal reproduction of the problem with instructions Try using hide() or show() methods of OverlayPanel in a typescript project.

Please tell us about your environment:

• React version: 16.8.5

• PrimeReact version: 3.1.2

• Browser: N/A

• Language: TypeScript 3.4.3