Bump package version to 0.7.0

A new minor version because the node engines supported has
changed. Also changed the node engine versions claimed as supported,
in the README.

Signed-off-by: Michael Bridgen <mikeb@squaremobius.net>

README.md

@@ -10,7 +10,7 @@
  * [Examples from RabbitMQ tutorials][tutes]
 
 A library for making AMQP 0-9-1 clients for Node.JS, and an AMQP 0-9-1
-client for Node.JS v0.8-0.12, v4-v14, and the intervening io.js
+client for Node.JS v0.8-0.12, v4-v15, and the intervening io.js
 releases.
 
 This library does not implement [AMQP

package.json

@@ -2,7 +2,7 @@
   "name": "amqplib",
   "homepage": "http://squaremo.github.io/amqp.node/",
   "main": "./channel_api.js",
-  "version": "0.6.0",
+  "version": "0.7.0",
   "description": "An AMQP 0-9-1 (e.g., RabbitMQ) library and client.",
   "repository": {
     "type": "git",