message: Updated node and npm version requirements
diff: ## Install
  -* **Note: requires a node version >= 6 and an npm version >= 3.**
  +* **Note: requires a node version >= 7 and an npm version >= 4.**
  * **If you have installation or compilation issues with this project, please see [our debugging guide](https://github.com/chentsulin/electron-react-boilerplate/issues/400)**
  First, clone the repo via git:
  