Update local build instructions

README.md

@@ -26,14 +26,15 @@ If you're a web dapp developer, we've got two types of guides for you:
 
 ## Building locally
 
- - Install [Node.js](https://nodejs.org/en/) version 8.11.3 and npm version 6.1.0
-   - If you are using [nvm](https://github.com/creationix/nvm#installation) (recommended) running `nvm use` will automatically choose the right node version for you.
-   - Select npm 6.1.0: ```npm install -g npm@6.1.0```
- - Install dependencies: ```npm install```
- - Install gulp globally with `npm install -g gulp-cli`.
- - Build the project to the `./dist/` folder with `gulp build`.
- - Optionally, to rebuild on file changes, run `gulp dev`.
- - To package .zip files for distribution, run `gulp zip`, or run the full build & zip with `gulp dist`.
+- Install [Node.js](https://nodejs.org) version 8 and the latest available npm@6
+    - If you are using [nvm](https://github.com/creationix/nvm#installation) (recommended) running `nvm use` will automatically choose the right node version for you.
+    - If you install Node.js manually, ensure you're using npm@6
+        - Install npm@6 using `npm install -g npm@6`
+- Install dependencies: `npm install`
+- Install gulp globally with `npm install -g gulp-cli`.
+- Build the project to the `./dist/` folder with `gulp build`.
+- Optionally, to rebuild on file changes, run `gulp dev`.
+- To package .zip files for distribution, run `gulp zip`, or run the full build & zip with `gulp dist`.
 
  Uncompressed builds can be found in `/dist`, compressed builds can be found in `/builds` once they're built.