update devdeps and required set DEBUG_NAME

.travis.yml

@@ -1,4 +1,6 @@
 language: node_js
 node_js:
-  - "7.6"
-after_script: npm run coverage
+  - "8"
+  - "10"
+script: "npm run test-cov"
+after_script: "npm i coveralls@3.0.1 && npm run report"

README.md

@@ -41,19 +41,21 @@ $ npm i -S @tadashi/debug
 
 The API is the same of https://github.com/visionmedia/debug
 
-**Attention**  
-You can set your prefix, default is: `tadashi-debug`
 
+## Environment Variables
 
-## Usage
+**Attention**
+
+You must set an environment variables `DEBUG_NAME`  
+Default is: `tadashi-debug`
 
-Using the follow code: **sample.js**
+
+## Usage
 
 ```js
 'use strict'
 
-const debug = require('@tadashi/debug')
-const {log, error, info, warn} = debug('my-api')
+const {log, error, info, warn} = require('@tadashi/debug')
 
 // log
 log('Apenas um show')

index.js

@@ -2,7 +2,9 @@
 
 const _debug = require('debug')
 
-function debug(prefix = 'tadashi-debug') {
+const {DEBUG_NAME = 'tadashi-debug'} = process.env
+
+function debug(prefix) {
 	const log = _debug(`${prefix}:log`)
 	const info = _debug(`${prefix}:info`)
 	const warn = _debug(`${prefix}:warn`)
@@ -25,4 +27,4 @@ function debug(prefix = 'tadashi-debug') {
 	}
 }
 
-module.exports = debug
+module.exports = debug(DEBUG_NAME)