Merge pull request #61 from amilajack/patch-1

Added optimal travis ci settings

.travis.yml

@@ -1,13 +1,25 @@
 sudo: false # http://docs.travis-ci.com/user/workers/container-based-infrastructure/
+
 language: node_js
+
 node_js:
   - 0.12
   - 4
   - 5
   - 6
 
+cache:
+  directories:
+    - node_modules
+
+install:
+  - npm i -g npm@latest
+  - npm install
+
 notifications:
   email:
     - medikoo+memoize@medikoo.com
 
-script: "npm test && npm run lint"
+script:
+  - npm run test
+  - npm run lint