Moved node.js test versions to match latest LTS

https://github.com/nodejs/Release

.travis.yml

@@ -3,24 +3,24 @@ addons:
   firefox: latest
 matrix:
   include:
-    # - os: linux
-    #   node_js: "4"
-    - os: linux
-      env: CXX=g++-4.8
-      node_js: "5"
     - os: linux
       node_js: "6"
     - os: linux
       env: CXX=g++-4.8
       node_js: "7"
-    # - os: osx
-    #   node_js: "4"
-    - os: osx
-      node_js: "5"
+    - os: linux
+      node_js: "8"
+    - os: linux
+      env: CXX=g++-4.8
+      node_js: "9"
     - os: osx
       node_js: "6"
     - os: osx
       node_js: "7"
+    - os: osx
+      node_js: "8"
+    - os: osx
+      node_js: "9"
 before_install:
   - export CHROME_BIN=chromium-browser
   - export DISPLAY=:99.0

appveyor.yml

@@ -1,8 +1,9 @@
 environment:
   matrix:
-    # - nodejs_version: "4"
     - nodejs_version: "6"
     - nodejs_version: "7"
+    - nodejs_version: "8"
+    - nodejs_version: "9"
 platform:
   - x86
   - x64