ci: enable travis npm cache (coder#110)

nhooyr · kylecarbs · commit 3e9d86ee91dc · 2019-03-08T09:21:11.000-08:00
* ci: enable travis npm cache * ci: upgrade travis version Thanks @zerdos * ci: switch to using yarn cache
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,6 @@
 language: node_js
 node_js:
-- 8.10.0
+- 8.15.0
 env:
   - VERSION="1.32.0-$TRAVIS_BUILD_NUMBER"
 matrix:
@@ -35,3 +35,4 @@ deploy:
   on:
     repo: codercom/code-server
     branch: master
+cache: yarn
