Fix minor spelling and grammar issue (#2165)

README.md

@@ -164,7 +164,7 @@ Preact supports modern browsers and IE9+:
 
 > 💁 _**Note:** You [don't need ES2015 to use Preact](https://github.com/developit/preact-in-es3)... but give it a try!_
 
-The easiest way to get started with Preact is to install [Preact CLI](https://github.com/preactjs/preact-cli). This simple command-line tool wraps up the best possible Webpack and Babel setup for you, and even keeps you up-to-date as the underlying tools change. Best of all, it's easy to understand! It builds your app in a single command (`preact build`), doesn't need any configuration, and bakes in best-practises 🙌.
+The easiest way to get started with Preact is to install [Preact CLI](https://github.com/preactjs/preact-cli). This simple command-line tool wraps up the best possible Webpack and Babel setup for you, and even keeps you up-to-date as the underlying tools change. Best of all, it's easy to understand! It builds your app in a single command (`preact build`), doesn't need any configuration, and bakes in best practices 🙌.
 
 The following guide assumes you have some sort of ES2015 build set up using babel and/or webpack/browserify/gulp/grunt/etc.