Use a Markdown README

Author: ggrossetie

README.adoc

@@ -0,0 +1,14 @@
+# Opal Runtime for Asciidoctor.js
+
+[![Travis build status](https://img.shields.io/travis/Mogztter/asciidoctor-opal-node-runtime/master.svg)](https://travis-ci.org/Mogztter/asciidoctor-opal-node-runtime)
+[![npm version](http://img.shields.io/npm/v/asciidoctor-opal-runtime.svg)](https://www.npmjs.org/package/asciidoctor-opal-runtime)
+
+
+:fire: **CAUTION**: This library is an _highly optimized_ version of the Opal runtime that contains the *bare minimum to run Asciidoctor*. If you are looking for a general purpose Opal runtime, please use https://www.npmjs.com/package/opal-runtime.
+
+## Usage
+
+```javascript
+var Opal = require('opal-runtime').Opal;
+// Now let's have fun with Opal!
+```

README.md

@@ -23,9 +23,7 @@
   "main": "src/index.js",
   "scripts": {
     "test": "mocha spec/*.spec.js",
-    "lint": "standard src/index.js spec npm",
-    "prepublishOnly": "node npm/prepublish.js",
-    "postpublish": "node npm/postpublish.js"
+    "lint": "standard src/index.js spec npm"
   },
   "homepage": "http://github.com/mogztter/asciidoctor-opal-node-runtime",
   "bugs": "https://github.com/mogztter/asciidoctor-opal-node-runtime/issues",