fix: typo in readme.md (#204)

Author: KwintenP

README.md

@@ -5,7 +5,7 @@ Welcome to the home of the [StackBlitz documentation site](https://developer.sta
 Our docs site was built with [VitePress](https://vitepress.vuejs.org/) 💙
 
 ## What is StackBlitz?
-StackBlitz is an **instant fullstack web IDE for the JavaScript ecosystem**. It's powered by [WebContainers](https://blog.stackblitz.com/posts/introducing-webcontainers/), the first WebAssembly-based operating system which **boots Node.js environment in milliseconds**, securely within your browser tab.
+StackBlitz is an **instant fullstack web IDE for the JavaScript ecosystem**. It is powered by [WebContainers](https://blog.stackblitz.com/posts/introducing-webcontainers/), the first WebAssembly-based operating system which **boots Node.js environment in milliseconds**, securely within your browser tab.
 
 Now you can use the web to build the web.