Typescript support

[KubaJastrz]

Thank you for this amazing react wrapper ❤️
Are you planning on adding typescript support to this package? I've seen the discussion on the main tippy repo (atomiks/tippyjs#186).
If you need any help, I'd love to assist 🙂

[atomiks]

Yes I'd like some help getting a .d.ts file merged for the package because I have 0 experience with
Typescript. If you can create a PR that would be awesome!! 🙏

[martensm]

I don't have time at the moment to create a PR but would something like this be sufficient?

import React from 'react'
import { Instance, Props } from 'tippy.js'

type Omit<T, K extends keyof T> = Pick<T, Exclude<keyof T, K>>

export interface TippyProps extends Omit<Props, 'content'> {
  content: JSX.Element | string
  children: JSX.Element
  onCreate?: (tip: Instance) => any
}

export default class Tippy extends React.Component<TippyProps> {}

[KateVuilova]

Hello! I've created a PR for this based on @martensm's work above. Let me know if you want any changes.