Docs: Update react-native-unimodules link

The react-native-unimodules link is updated. 
The current repo has been deprecated in favor of expo/expo monorepo

docs/libraries.md

@@ -58,7 +58,7 @@ Many of the libraries you will find on the directory are from [React Native Comm
 
 Libraries built by the React Native Community are driven by volunteers and individuals at companies that depend on React Native. They often support iOS, tvOS, Android, Windows, but this varies across projects. Many of the libraries in this organization were once React Native Core Components and APIs.
 
-Libraries built by Expo are all written in TypeScript and support iOS, Android, and react-native-web wherever possible. They usually require that you first install [react-native-unimodules](https://github.com/unimodules/react-native-unimodules) in order to use in your React Native app.
+Libraries built by Expo are all written in TypeScript and support iOS, Android, and react-native-web wherever possible. They usually require that you first install [react-native-unimodules](https://github.com/expo/expo/tree/master/packages/react-native-unimodules) in order to use in your React Native app.
 
 After React Native Directory, the [npm registry](https://www.npmjs.com/) is the next best place if you can't find a library specifically for React Native on the directory. The npm registry is the definitive source for JavaScript libraries, but the libraries that it lists may not all be compatible with React Native. React Native is one of many JavaScript programming environments, including Node.js, web browsers, Electron, and more, and npm includes libraries that work for all of these environments.