[Tests] up to node v6.1

Author: ljharb

.travis.yml

@@ -1,5 +1,8 @@
 language: node_js
 node_js:
+  - "6.1"
+  - "6.0"
+  - "5.11"
   - "5.10"
   - "5.9"
   - "5.8"
@@ -62,6 +65,8 @@ matrix:
     - node_js: "0.12"
       env: TRAVIS_RUN_SAUCE=false TRAVIS_RUN_LINT_ONLY=false
   allow_failures:
+    - node_js: "6.0"
+    - node_js: "5.10"
     - node_js: "5.9"
     - node_js: "5.8"
     - node_js: "5.7"