Raised the Node.js constraint

.travis.yml

@@ -1,6 +1,6 @@
 dist: trusty
 language: node_js
-node_js: [8, 10, 11]
+node_js: [10, 11]
 notifications: {email: false}
 sudo: false
 

README.md

@@ -1,5 +1,5 @@
 # Enums for JS
-![Runtime](https://img.shields.io/badge/node-%3E%3D8.12-brightgreen.svg) ![Release](https://img.shields.io/npm/v/@cedx/enum.svg) ![License](https://img.shields.io/npm/l/@cedx/enum.svg) ![Downloads](https://img.shields.io/npm/dt/@cedx/enum.svg) ![Dependencies](https://david-dm.org/cedx/enum.js.svg) ![Coverage](https://coveralls.io/repos/github/cedx/enum.js/badge.svg) ![Build](https://travis-ci.com/cedx/enum.js.svg)
+![Runtime](https://img.shields.io/badge/node-%3E%3D10.13-brightgreen.svg) ![Release](https://img.shields.io/npm/v/@cedx/enum.svg) ![License](https://img.shields.io/npm/l/@cedx/enum.svg) ![Downloads](https://img.shields.io/npm/dt/@cedx/enum.svg) ![Dependencies](https://david-dm.org/cedx/enum.js.svg) ![Coverage](https://coveralls.io/repos/github/cedx/enum.js/badge.svg) ![Build](https://travis-ci.com/cedx/enum.js.svg)
 
 Yet another implementation of enumerated types for [JavaScript](https://developer.mozilla.org/en-US/docs/Web/JavaScript).
 

doc/installation.md

@@ -5,13 +5,13 @@ Before installing **Enums for JS**, you need to make sure you have [Node.js](htt
 and [npm](https://www.npmjs.com), the Node.js package manager, up and running.
 
 !!! warning
-    Enums for JS requires Node.js >= **8.12.0**.
+    Enums for JS requires Node.js >= **10.13.0**.
 
 You can verify if you're already good to go with the following commands:
 
 ```shell
 node --version
-# v10.12.0
+# v10.13.0
 
 npm --version
 # 6.4.1

gulpfile.js

@@ -1,3 +1,5 @@
+'use strict';
+
 const {spawn} = require('child_process');
 const del = require('del');
 const {promises} = require('fs');

package.json

@@ -31,7 +31,7 @@
     "webpack-cli": "^3.1.2"
   },
   "engines": {
-    "node": ">=8.12.0",
+    "node": ">=10.13.0",
     "npm": ">=6.4.0"
   },
   "keywords": [