Merge pull request #459 from pelias/update_travis_version

Update travis versions

.travis.yml

@@ -3,18 +3,12 @@ language: node_js
 node_js:
   - 0.10
   - 0.12
-  - 4.0
+  - 4.4
-  - 4.1
+  - 5.8
-  - 4.2
-  - 4.3
-  - 5.6
 matrix:
     allow_failures:
-        - node_js: 4.0
+        - node_js: 4.4
-        - node_js: 4.1
+        - node_js: 5.8
-        - node_js: 4.2
-        - node_js: 4.3
-        - node_js: 5.6
 env:
   global:
     - CXX=g++-4.8