removed: nodeJS 6 support

.travis.yml

@@ -1,7 +1,6 @@
 language: node_js
 sudo: true
 node_js:
-  - "6"
   - "8"
 dist: trusty
 before_install: if [[ `npm -v` < 3 ]]; then npm i -g npm@latest; fi

CHANGELOG.md

@@ -4,6 +4,9 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 [Unreleased]
 ---------------------
+##### Removed 
+- NodeJS 6 support.
+
 ##### Added
 - Support for 'no-ticks' appearance in range widget.
 

README.md

@@ -7,7 +7,7 @@ _The modern [Enketo Smart Paper](https://enketo.org) web application._
 
 #### Manually:
 
-1. Install JS prerequisites: [Node.js](https://github.com/nodesource/distributions) (8.x LTS recommended, and at least 6.x), [Grunt Client](http://gruntjs.com), and [Node-Gyp](https://github.com/TooTallNate/node-gyp)
+1. Install JS prerequisites: [Node.js](https://github.com/nodesource/distributions) (8.x LTS recommended), [Grunt Client](http://gruntjs.com), and [Node-Gyp](https://github.com/TooTallNate/node-gyp)
 2. Install [Redis](http://redis.io/topics/quickstart)
 3. Install build-essential and git (and libfontconfig to run tests) with `(sudo) apt-get install build-essential git libfontconfig`
 4. Clone this repository