Added yarn support, switched to prepublishOnly

.travis.yml

@@ -3,10 +3,22 @@ language: node_js
 node_js:
   - "4.0"
   - "4"
+  - "7"
   - "stable"
 
+# before_install:
+#   - npm config set ignore-scripts true
+
 script:
-  - npm test
+  - yarn test
+  - yarn run lint
+  - yarn run build
+  - yarn run tsdef
+
+cache: yarn
+# cache:
+#   directories:
+#     - node_modules
 
 branches:
   except:

package.json

@@ -17,7 +17,7 @@
     "build:lib": "babel src --out-dir lib",
     "analyze": "webpack src/index.js dist/index.js --config webpack.config.prod.js --json > stats.json",
     "preversion": "npm run test && npm run lint",
-    "prepublish": "npm test && npm run lint && npm run build && npm run tsdef",
+    "prepublishOnly": "npm test && npm run lint && npm run build && npm run tsdef",
     "postversion": "git push && git push --tags",
     "publish:beta": "npm publish --tag beta",
     "tsdef": "cp -f immutable.d.ts lib/",