Added coverage testing at CI process

.coveralls.yml

@@ -0,0 +1 @@
+repo_token: $REPO_TOKEN

README.md

@@ -1,25 +1,27 @@
 # 📣 Kuglo
 
+[![Coverage Status](https://coveralls.io/repos/github/kurone-kito/kuglo/badge.svg?branch=master)](https://coveralls.io/github/kurone-kito/kuglo?branch=master)
+
 Practice for desktop app using [Electron](https://github.com/electron/electron)
 
-# Debugging & Testing
+## Debugging & Testing
 
-## Prepare
+### Prepare
 
 Requirement: nodejs >= 8.10
 
 ```sh
-$ npm i; npm run build
+npm install
 ```
 
-## Debugging
+### Debugging
 
 ```sh
-$ npm start
+npm start
 ```
 
-## Testing
+### Testing
 
 ```sh
-$ npm test
+npm test
 ```

package.json

@@ -20,10 +20,10 @@
   "scripts": {
     "install": "npm run build",
     "start": "electron ./",
-    "test": "eslint src/**/* && jest --coverage",
+    "test": "jest --coverage --coverageReporters=text-lcov | coveralls",
     "build": "webpack",
     "pack": "electron-builder --x64",
-    "prettier": "prettier -c --write ./**/*"
+    "test:unit": "jest --coverage"
   },
   "engines": {
     "node": ">=8.10"