Add Yarn usage in README

.npmrc

@@ -0,0 +1 @@
+save-exact = true

.travis.yml

@@ -8,11 +8,6 @@ node_js:
 - 8 # EOL: December 2019
 - 6 # EOL: April 2019
 
-script:
-- npm run test-mocha
-- npm run test-readme
-- npm run lint
-
 after_script:
 - npm run coveralls
 

LICENSE

@@ -1,6 +1,6 @@
 The MIT License (MIT)
 
-Copyright (c) 2017 Jérémie Astori
+Copyright (c) 2015 Jérémie Astori
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -28,13 +28,18 @@ chai.use(require('./chai-immutable'));
 
 ### Node.js
 
-Install via [npm](http://npmjs.org):
+Install via [npm](http://npmjs.org) or [`yarn`](https://yarnpkg.com/en/):
 
 ```bash
-npm install chai-immutable
+npm install --save-dev chai-immutable
+# or:
+yarn add --dev chai-immutable
 ```
 
-⚠️ To use `chai-immutable` with Chai v4, you need to use `npm install chai-immutable@next` instead, until I am done with the v2 release of this plugin. I apologize for the inconvenience in the meantime.
+⚠️ To use `chai-immutable` with Chai v4, you need to use
+`npm install --save-dev chai-immutable@next` (or
+`yarn add --dev chai-immutable@next`) instead, until I am done with the v2
+release of this plugin. I apologize for the inconvenience in the meantime.
 
 You can then use this plugin as any other Chai plugins:
 

appveyor.yml

@@ -23,9 +23,7 @@ install:
 test_script:
   - node --version
   - npm --version
-  - npm run test-mocha
-  - npm run test-readme
-  - npm run lint
+  - npm run test
 
 # Don't actually build
 build: off

package.json

@@ -8,9 +8,9 @@
   },
   "scripts": {
     "lint": "eslint --ignore-path .gitignore . --report-unused-disable-directives",
-    "test": "npm run test-mocha; npm run test-readme; npm run lint",
-    "test-readme": "mocha --compilers md:fulky/md-compiler README.md",
-    "test-mocha": "nyc mocha",
+    "test": "run-s --continue-on-error test:* lint",
+    "test:readme": "mocha --compilers md:fulky/md-compiler README.md",
+    "test:mocha": "nyc mocha",
     "coveralls": "nyc report --reporter=text-lcov | coveralls"
   },
   "repository": {
@@ -51,6 +51,7 @@
     "fulky": "0.2.0",
     "immutable": "3.8.2",
     "mocha": "5.2.0",
+    "npm-run-all": "4.1.3",
     "nyc": "11.8.0"
   }
 }