Travis CI: Switch from deprecated stable NodeJS version to v4.x.x and v5.x.x

ntwb · ntwb · commit 345700e97495 · 2015-12-30T00:49:42.000+11:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,7 @@
 language: node_js
 node_js:
-  - 'stable'
+  - '5'
+  - '4'
   - '0.12'
   - '0.10'
 before_install:
