.travis.yml in logster-2.6.0

- old
+ new

@@ -1,9 +1,9 @@
 ---
 language: node_js
 node_js:
-  - "6"
+  - "8"
 
 sudo: false
 dist: trusty
 
 addons:
@@ -16,11 +16,12 @@
 env:
   global:
     # See https://git.io/vdao3 for details.
     - JOBS=1
 
-before_install:
-  - npm config set spin false
+branches:
+  only:
+    - master
 
 script:
   - npm run lint:hbs
   - npm run lint:js
   - npm test