add contributor, remove unsupported node versions from travis, update docs

Author: 75lb

.travis.yml

@@ -1,8 +1,6 @@
 language: node_js
 node_js:
   - 6
-  - 7
   - 8
-  - 9
   - 10
   - 11

README.md

@@ -15,13 +15,13 @@ const sortBy = require('sort-array')
 ```
 <a name="exp_module_sort-array--sortBy"></a>
 
-### sortBy(recordset, columnNames, [customOrder]) ⇒ <code>Array</code> ⏏
+### sortBy(recordset, sortBy, [customOrder]) ⇒ <code>Array</code> ⏏
 **Kind**: Exported function  
 
 | Param | Type | Description |
 | --- | --- | --- |
 | recordset | <code>Array.&lt;object&gt;</code> | Input array of objects |
-| columnNames | <code>string</code> \| <code>Array.&lt;string&gt;</code> | One or more property expressions to sort by,  e.g. `'name'` or `'name.first'`. |
+| sortBy | <code>string</code> \| <code>Array.&lt;string&gt;</code> | One or more property expressions to sort by,  e.g. `'name'` or `'name.first'`. |
 | [customOrder] | <code>object</code> | Custom sort order definitions. An object where each key is the property expression and the value is an array specifying the sort order. Example: <br> `{ importance: [ 'speed', 'strength', 'intelligence' ]}` |
 
 **Example**  

index.js

@@ -1,4 +1,3 @@
-const arrayify = require('array-back')
 const t = require('typical')
 
 /**
@@ -91,6 +90,8 @@ module.exports = sortBy
  * ```
  */
 function sortBy (recordset, sortBy, sortTypes, namedConfigs) {
+  const arrayify = require('array-back')
+
   // First stage data preparation
   recordset = arrayify(recordset)
   sortBy = arrayify(sortBy)

package.json

@@ -1,6 +1,9 @@
 {
   "name": "sort-array",
   "author": "Lloyd Brookes <75pound@gmail.com>",
+  "contributors": [
+    "Ben Vickers <bjvickers@protonmail.com>"
+  ],
   "version": "2.0.0",
   "description": "Sort an array of objects by any property value, at any depth, in any custom order.",
   "repository": "https://github.com/75lb/sort-array.git",