Update README.md, fix a typo (#5966)

Author: Bob Conan

README.md

@@ -10,7 +10,7 @@ The Select control for [React](https://reactjs.org). Initially built for use in
 See [react-select.com](https://www.react-select.com) for live demos and comprehensive docs.
 
 `react-select` is funded by [Thinkmill](https://www.thinkmill.com.au) and [Atlassian](https://atlaskit.atlassian.com).
-We are an open source project that is continously supported by the community.
+We are an open source project that is continuously supported by the community.
 
 React Select helps you develop powerful select components that _just work_ out of the box, without stopping you from customising the parts that are important to you.