Speed up Travis builds

jwilsson · jwilsson · commit 7679a9ce71d7 · 2017-07-18T07:03:13.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,13 +1,28 @@
+dist: trusty
 sudo: false
 
 language: node_js
+
 node_js:
   - "4"
   - "5"
   - "6"
   - "7"
   - "8"
 
+git:
+  depth: 1
+
+branches:
+  only:
+    - master
+    - /^greenkeeper/.*$/
+
+cache:
+  directories:
+    - $HOME/.npm
+    - node_modules
+
 before_script:
   - node --version
   - npm --version
