Update .travis.yml

cheton · cheton · commit 12b1398aec08 · 2017-01-26T23:59:05.000+08:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,8 +1,21 @@
+sudo: required
 dist: trusty
+group: edge
+
 language: node_js
+
+os:
+  - linux
+
 node_js:
   - '6'
   - '5'
   - '4'
+
+before_install:
+  - npm install -g npm
+  - npm --version
+
 after_success:
   - npm run coveralls
+  - npm run coverage-clean
