Add support for JavaScript classes (ES6)

.npmignore

@@ -1,7 +1,5 @@
 spec
 script
-src
-*.coffee
 .npmignore
 .DS_Store
 npm-debug.log

.travis.yml

@@ -4,7 +4,10 @@ notifications:
   email: false
 
 node_js:
-  - 0.10
+  - 8
+  - 10
+  - 12
+  - 14
 
 branches:
   only:

Gruntfile.coffee

@@ -23,7 +23,7 @@ module.exports = (grunt) ->
 
     shell:
       test:
-        command: 'node --harmony_collections node_modules/jasmine-focused/bin/jasmine-focused --coffee --captureExceptions spec'
+        command: 'jasmine-focused --coffee --captureExceptions spec'
         options:
           stdout: true
           stderr: true

README.md

@@ -1,5 +1,50 @@
 # Mixto: A simple mixin superclass [![Build Status](https://travis-ci.org/atom/mixto.png?branch=master)](https://travis-ci.org/atom/mixto)
 
+# JavaScript Classes (ES6)
+
+To create a mixin, subclass mixto:
+
+```js
+const Mixin = require('mixto/lib/es6')
+
+class MyMixin extends Mixin {
+  static classMethod() { console.log("foo"); }
+  instanceMethod() { console.log("bar"); }
+}
+```
+
+Then mix into classes with `.includeInto`:
+
+```js
+class MyClass {
+  static initClass() {
+    MyMixin.includeInto(this); // adds all the mixin's class properties or prototype properties to the target class if they aren't already defined
+  }
+}
+MyClass.initClass();
+
+MyClass.classMethod();
+(new MyClass).instanceMethod();
+```
+
+Or extend individual objects with `.extend`:
+
+```js
+const myObject = {a: 1, b: 2};
+MyMixin.extend(myObject);   // adds all the mixin's prototype properties to the target object if they aren't already defined
+myObject.instanceMethod();
+```
+
+Or build standalone instances of your 'mixin':
+
+```js
+const standalone = new MyMixin;
+standalone.instanceMethod();
+```
+
+
+# CoffeeScript 1 Classes (ES5)
+
 To create a mixin, subclass mixto:
 
 ```coffee
@@ -15,7 +60,7 @@ Then mix into classes with `.includeInto`:
 ```coffee
 class MyClass
   MyMixin.includeInto(this)
-  
+
 MyClass.classMethod()
 (new MyClass).instanceMethod()
 ```
@@ -30,7 +75,7 @@ myObject.instanceMethod()
 
 Or build standalone instances of your 'mixin':
 
-```
+```coffee-script
 standalone = new MyMixin
 standalone.instanceMethod()
 ```