fix travis

Author: olegman

.travis.yml

@@ -1,15 +1,14 @@
 language: node_js
 sudo: false
 node_js:
-  - 6
+  - 8
 
 cache:
   directories:
     - node_modules
 
 script:
-  - typings install
-  - npm run transpile
+  - yarn transpile
 
 deploy:
   provider: npm