README.md in mumuki-gobstones-blockly-0.38.1 vs README.md in mumuki-gobstones-blockly-0.39.0

@@ -5,11 +5,11 @@
 ## Install Development Environment
 
 First, make sure you have the [Polymer CLI](https://www.npmjs.com/package/polymer-cli) and Bower installed.
 
 ```Bash
-$ npm install -g bower polymer-cli
+$ npm install -g bower polymer-cli vulcanize
 ```
 
 Then, run both `npm install` and `bower install`.
 
 This will install [Husky](https://github.com/typicode/husky) and a Git hook that will lint your code before each commit. It's recommended to install an [ESlint](http://eslint.org/) extension on your code editor, to see linting errors when you code.
@@ -52,13 +52,13 @@
 ./build.sh
 ```
 
 ## Gem wrapper
 
-This module can also be deployed a ruby gem. `mumuki-gobstones-blockly` works with Ruby 2.3.1
+This module can also be deployed a ruby gem. `mumuki-gobstones-blockly` works with Ruby >= 2.3.1
 
 ```bash
-./build-gem
+./build-gem.sh
 ```
 
 ## Tagging and releasing
 
 Run the `./tag.sh` script with the version you want. For instance, to tag version `1.0.0` you should execute: