Update README

Author: eddeee888

README.md

@@ -25,3 +25,4 @@
 | `createReactComponent.testLibrary`            | Specifies what testing library to import <br><br> Options: <br> - `react-testing-library` (_default_) <br> - `enzyme`                    |
 | `createReactComponent.testingLibrary.cleanup` | Specifies whether or not to generate cleanup when using react-testing-library <br><br> Options: <br> - `true` <br> - `false` (_default_) |
 | `createReactComponent.module`                 | Specifies whether or not to create a module <br><br> Options: <br> - `true` (_default_) <br> - `false`                                   |
+| `createReactComponent.functionType`           | Specifies whether to use a normal function or function expression for the component <br><br> Options <br> - `function` (default) <br> - `expression` |