Merge pull request #2 from Turbo87/yarn

Use yarn instead of npm

.travis.yml

@@ -12,8 +12,7 @@ addons:
   chrome: stable
 
 cache:
-  directories:
-    - $HOME/.npm
+  yarn: true
 
 env:
   global:
@@ -35,9 +34,11 @@ matrix:
     - env: EMBER_TRY_SCENARIO=ember-canary
 
 before_install:
-  - npm config set spin false
-  - npm install -g npm@4
-  - npm --version
+  - curl -o- -L https://yarnpkg.com/install.sh | bash
+  - export PATH=$HOME/.yarn/bin:$PATH
+
+install:
+  - yarn install --no-lockfile --non-interactive
 
 script:
   # Usually, it's ok to finish the test scenario without reverting

README.md

@@ -6,7 +6,7 @@ This README outlines the details of collaborating on this Ember addon.
 
 * `git clone <repository-url>` this repository
 * `cd ember-ordered-set`
-* `npm install`
+* `yarn install`
 
 ## Running
 
@@ -15,7 +15,7 @@ This README outlines the details of collaborating on this Ember addon.
 
 ## Running Tests
 
-* `npm test` (Runs `ember try:each` to test your addon against multiple Ember versions)
+* `yarn test` (Runs `ember try:each` to test your addon against multiple Ember versions)
 * `ember test`
 * `ember test --server`