Merge pull request #1 from hidori/feature/add-coveredge

 Add coverage via nyc

.gitignore

@@ -57,3 +57,6 @@ typings/
 # dotenv environment variables file
 .env
 
+coverage/
+.nyc_output/
+.coveralls.yml

.travis.yml

@@ -1,6 +1,11 @@
 language: node_js
 node_js:
 - 8.9.4
+- 8.10.0
 notifications:
   slack:
     secure: 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
+after_success: "./node_modules/.bin/nyc report --reporter=text-lcov | ./node_modules/.bin/coveralls"
+env:
+  global:
+    secure: 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

README.md

@@ -1,14 +1,15 @@
 [![Software License](https://img.shields.io/badge/license-MIT-brightgreen.svg?style=flat-square)](LICENSE)
-[![Build Status](https://travis-ci.org/rcmdnk/travis-test.svg?branch=master)](https://travis-ci.org/rcmdnk/travis-test)
 [![Maintainability](https://api.codeclimate.com/v1/badges/1dd1bfe212c8d70c9b8b/maintainability)](https://codeclimate.com/github/hidori/node-json-logger/maintainability)
+[![Build Status](https://travis-ci.org/rcmdnk/travis-test.svg?branch=master)](https://travis-ci.org/rcmdnk/travis-test)
+[![Coverage Status](https://coveralls.io/repos/github/hidori/node-json-logger/badge.svg?branch=feature%2Fadd-coveredge)](https://coveralls.io/github/hidori/node-json-logger?branch=feature%2Fadd-coveredge)
 
 node-json-logger
 ----
 output logs as JSON to STDOUT
 
 # Install
 ```sh
-npm install -s node-json-logger
+npm i node-json-logger
 ```
 # Usage
 ```js
@@ -25,18 +26,19 @@ Output:
 ```
 
 # API
-## xxx
-Output log. xxx is one of the [Levels](#Levels)
-```
+```js
 logger.xxx(message, details)
 ```
+Note:
+* xxx is one of the [Levels](#Levels)
+
 Arguments:
-* message: Specify log message as string.
-* details: Specify log details as object (optional).
+* message: Specify a message as string.
+* details: Specify details as object. (optional)
 
 # Configuration
 ## level
-Specify log output level (optional, default is `debug`).
+Specify output level. (optional, default is `debug`)
 ```js
 const Logger = require('node-json-logger');
 const logger = new Logger({ level: 'error'});
@@ -64,7 +66,7 @@ Level and output:
 | `{ level: 'fatal' }` | -     | -     | -    | -    | -     | O     |
 
 ## addendum
-Spcify staic addeundum field. this is optional.
+Spcify addeundum fields. (optional)
 ```js
 const Logger = require('node-json-logger');
 const logger = new Logger({
@@ -80,7 +82,7 @@ Output:
 {"level":"info","source":"source.","message":"info."}
 ```
 
-# <a href="#"></a>Levels
+# <a href="#Levels"></a>Levels
 * trace
 * debug
 * info