added changelog, test travis to check node 4 and 5 support

.travis.yml

@@ -1,5 +1,7 @@
 language: node_js
 node_js:
+   - "4"
+   - "5"
    - "6"
    - "7"
    - "8"

CHANGELOG.md

@@ -0,0 +1,9 @@
+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
+
+## [2.0.1] - 2018-02-11
+### Added
+- a new changelog

package.json

@@ -1,7 +1,7 @@
 {
   "name": "emailjs",
   "description": "send text/html emails and attachments (files, streams and strings) from node.js to any smtp server",
-  "version": "2.0.0",
+  "version": "2.0.1",
   "author": "eleith",
   "contributors": [
     "izuzak",