update(readme): remove 16.7 notice

Author: fouad

README.md

@@ -1,12 +1,5 @@
 # `@rehooks/component-size`
 
-> React hook for determining the size of a component
-
-> **Note:** This is using the new [React Hooks API Proposal](https://reactjs.org/docs/hooks-intro.html)
-> which is subject to change until React 16.7 final.
->
-> You'll need to install `react`, `react-dom`, etc at `^16.7.0-alpha.0`
-
 ## Install
 
 ```sh