Library mainainance

- Replace Mocha and Chai with Jest for testing the library.
- Replace codecov with coveralls for tests coverage.
- Update devDependencies.

Author: georapbox

Diff for: .eslintrc.js

@@ -3,7 +3,7 @@ module.exports = {
     browser: true,
     node: true,
     es6: true,
-    mocha: true
+    jest: true
   },
   parserOptions: {
     ecmaVersion: 9,

Diff for: .npmrc

@@ -0,0 +1 @@
+save-prefix='~'

Diff for: .travis.yml

@@ -4,10 +4,7 @@ node_js:
 branches:
   only:
     - master
-before_install:
-  - npm i -g codecov
 install:
   - npm install
 script:
-  - npm run clean && npm run lint && npm test && npm run build
-  - codecov
+  - npm run clean && npm run lint && npm run build && npm run coveralls

Diff for: CHANGELOG.md

@@ -1,5 +1,11 @@
 # CHANGELOG
 
+## v4.1.0
+
+- Replace Mocha and Chai with Jest for testing the library.
+- Replace codecov with coveralls for tests coverage.
+- Update `devDependencies`.
+
 ## v4.0.0
 
 ### BREAKING CHANGES

Diff for: README.md

@@ -2,16 +2,16 @@
 
 Immutable versions of normally mutable array methods
 
-[![Build Status](https://travis-ci.com/georapbox/immutable-arrays.svg?branch=master)](https://travis-ci.com/georapbox/immutable-arrays)
 [![npm version](https://img.shields.io/npm/v/immutable-arrays.svg)](http://badge.fury.io/js/immutable-arrays)
-[![npm downloads](https://img.shields.io/npm/dt/immutable-arrays.svg)](http://badge.fury.io/js/immutable-arrays)
-[![npm license](https://img.shields.io/npm/l/immutable-arrays.svg)](http://badge.fury.io/js/immutable-arrays)
-[![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg)](http://makeapullrequest.com)
+[![Build Status](https://travis-ci.com/georapbox/immutable-arrays.svg?branch=master)](https://travis-ci.com/georapbox/immutable-arrays)
 [![Maintainability](https://api.codeclimate.com/v1/badges/a9558f63e22c3e89d06c/maintainability)](https://codeclimate.com/github/georapbox/immutable-arrays/maintainability)
 [![Issue Count](https://codeclimate.com/github/georapbox/immutable-arrays/badges/issue_count.svg)](https://codeclimate.com/github/georapbox/immutable-arrays)
-[![Codecov](https://img.shields.io/codecov/c/github/georapbox/immutable-arrays/master.svg)](https://codecov.io/gh/georapbox/immutable-arrays)
+[![Coverage Status](https://coveralls.io/repos/github/georapbox/immutable-arrays/badge.svg?branch=master)](https://coveralls.io/github/georapbox/immutable-arrays?branch=master)
 [![Dependencies](https://david-dm.org/georapbox/immutable-arrays.svg)](https://david-dm.org/georapbox/immutable-arrays)
 [![devDependency Status](https://david-dm.org/georapbox/immutable-arrays/dev-status.svg)](https://david-dm.org/georapbox/immutable-arrays?type=dev)
+[![npm license](https://img.shields.io/npm/l/immutable-arrays.svg)](http://badge.fury.io/js/immutable-arrays)
+[![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg)](http://makeapullrequest.com)
+[![npm downloads](https://img.shields.io/npm/dt/immutable-arrays.svg)](http://badge.fury.io/js/immutable-arrays)
 
 ## Install
 

Diff for: jest.config.js

@@ -0,0 +1,3 @@
+module.exports = {
+  coverageReporters: ['json', 'lcov', 'text', 'clover', 'html']
+};