feat: update readme

Author: ugogo

README.md

@@ -15,14 +15,22 @@ A verification code input, autocompletion friendly
 - [Controllable](https://codesandbox.io/s/controllable-32dfy)
 - [Custom Styles](https://codesandbox.io/s/custom-styles-bw8s4)
 
-## Install
+## peerDependencies
 
-```bash
-npm install --save react-input-verification-code
 ```
+{
+  "react": ">=16.0.0",
+  "styled-components": ">=5.0.0"
+}
+```
+## Install
 
 ```bash
 yarn add react-input-verification-code
+
+# if you don't use `styled-components` in your project
+# you have to install it as well
+yarn add react-input-verification-code styled-components
 ```
 
 ## Usage