feat(ci): add node.js 6 (stable) testing

Author: daviddias

.travis.yml

@@ -3,6 +3,7 @@ language: node_js
 node_js:
   - 4
   - 5
+  - "stable"
 
 # Make sure we have new NPM.
 before_install:

package.json

@@ -34,7 +34,7 @@
     "chai": "^3.5.0",
     "gulp": "^3.9.1",
     "hapi": "^14.1.0",
-    "interface-ipfs-core": "^0.7.2",
+    "interface-ipfs-core": "^0.8.0",
     "ipfsd-ctl": "^0.14.0",
     "passthrough-counter": "^1.0.0",
     "pre-commit": "^1.1.3",