Stop testing Node.js v4.2 at Travis since ESLint does not run on it anymore

Author: paazmaya

.travis.yml

@@ -1,7 +1,6 @@
 sudo: false
 language: node_js
 node_js:
-  - "4.2"
   - "6"
   - "8"
 cache:

README.md

@@ -12,7 +12,7 @@ A [Grunt](http://gruntjs.com/) task to run your [Jasmine](http://jasmine.github.
 feature suite using [jasmine-npm](https://github.com/jasmine/jasmine-npm)
 and [Istanbul](https://github.com/gotwarlost/istanbul) for code coverage reports.
 
-The minimum supported Node.js version is `4.2.0` (LTS), and while works also in `0.10.x`, no quarantees are given.
+The minimum supported Node.js version is `4.2.0` (LTS), and while works also in `0.10.x`, no guarantees are given. Also note that Node.js versions prior to 6 are not tested.
 
 ## Getting Started