Merge pull request #23 from SparkPost/upgrades

Upgrades to dependencies and tests

.travis.yml

@@ -1,4 +1,6 @@
 language: node_js
 node_js:
-- '4.1'
-- '4.0'
+  - 6
+  - 8
+  - 9
+  - node

README.md

@@ -1,12 +1,12 @@
 <a href="https://www.sparkpost.com"><img src="https://www.sparkpost.com/sites/default/files/attachments/SparkPost_Logo_2-Color_Gray-Orange_RGB.svg" width="200px"/></a>
 
-[Sign up](https://app.sparkpost.com/join?plan=free-0817?src=Social%20Media&sfdcid=70160000000pqBb&pc=GitHubSignUp&utm_source=github&utm_medium=social-media&utm_campaign=github&utm_content=sign-up) for a SparkPost account and visit our [Developer Hub](https://developers.sparkpost.com) for even more content.
+[Sign up](https://app.sparkpost.com/join?plan=free-0817?src=Social%20Media&sfdcid=70160000000pqBb&pc=GitHubSignUp&utm_source=github&utm_medium=social-media&utm_campaign=github&utm_content=sign-up) for a SparkPost account and visit our [Developer Hub](https://developers.sparkpost.com) for more resources.
 
 # SparkPost transport for Nodemailer
 ## nodemailer-sparkpost-transport
 
 [![Build Status](https://travis-ci.org/SparkPost/nodemailer-sparkpost-transport.svg?branch=master)](https://travis-ci.org/SparkPost/nodemailer-sparkpost-transport)
-[![NPM version](https://badge.fury.io/js/nodemailer-sparkpost-transport.png)](http://badge.fury.io/js/nodemailer-sparkpost-transport) [![Slack Status](http://slack.sparkpost.com/badge.svg)](http://slack.sparkpost.com)
+[![NPM version](https://badge.fury.io/js/nodemailer-sparkpost-transport.png)](http://badge.fury.io/js/nodemailer-sparkpost-transport)
 
 ## Usage
 
@@ -27,7 +27,7 @@ var transporter = nodemailer.createTransport(sparkPostTransport(options));
 where:
 
   - **options** defines connection _default_ transmission properties
-    - `sparkPostApiKey` - SparkPost [API Key](https://app.sparkpost.com/account/credentials). If not provided, it will use the `SPARKPOST_API_KEY` env var.
+    - `sparkPostApiKey` - SparkPost [API Key](https://app.sparkpost.com/account/api-keys). If not provided, it will use the `SPARKPOST_API_KEY` env var.
     - `endpoint` - The endpoint to use for the SparkPost API requests. If you have a SparkPost EU account, set this to `https://api.eu.sparkpost.com` (optional)
     - `campaign_id` - Name of the campaign (optional)
     - `metadata` - Transmission level metadata containing key/value pairs (optional)