Update node version to 10.x in README (screepers#136)

* Corrects version numbering on README.md regarding Node dependency
* 1) Updated .gitignore to exclude build/*

Author: djD-REK

.gitignore

@@ -10,6 +10,7 @@
 /tsc-out
 /node_modules
 /_book
+/build/*
 
 # TypeScript definitions installed by Typings
 /typings

README.md

@@ -6,9 +6,9 @@ Screeps Typescript Starter is a starting point for a Screeps AI written in Types
 
 You will need:
 
- - [Node.JS](https://nodejs.org/en/download) (>= 8.0.0)
- - A Package Manager ([Yarn](https://yarnpkg.com/en/docs/getting-started) or [npm](https://docs.npmjs.com/getting-started/installing-node))
- - Rollup CLI (Optional, install via `npm install -g rollup`)
+- [Node.JS](https://nodejs.org/en/download) (10.x)
+- A Package Manager ([Yarn](https://yarnpkg.com/en/docs/getting-started) or [npm](https://docs.npmjs.com/getting-started/installing-node))
+- Rollup CLI (Optional, install via `npm install -g rollup`)
 
 Download the latest source [here](https://github.com/screepers/screeps-typescript-starter/archive/master.zip) and extract it to a folder.