Add ink-big-text to Useful Components in readme (#73)

Author: sindresorhus

readme.md

@@ -83,6 +83,7 @@ render(<Counter/>);
 - [ink-box](https://github.com/sindresorhus/ink-box) - Box component.
 - [ink-text-animation](https://github.com/yardnsm/ink-text-animation) - Text animation component.
 - [ink-gradient](https://github.com/sindresorhus/ink-gradient) - Gradient color component.
+- [ink-big-text](https://github.com/sindresorhus/ink-big-text) - Awesome text component.
 
 ## Built with Ink