Update travis/appveyor to node versions we support

.travis.yml

@@ -3,9 +3,7 @@ language: node_js
 node_js:
   - "0.10"
   - "0.12"
-  - "4.0"
-  - "4.1"
-  - "4.2"
+  - "4"
   - "5"
   - "6"
   - "7"

appveyor.yml

@@ -8,12 +8,14 @@ environment:
     - nodejs_version: "0.12"
     - nodejs_version: "4"
     - nodejs_version: "5"
+    - nodejs_version: "6"
+    - nodejs_version: "7"
+    - nodejs_version: "8"
 platform:
   - x86
   - x64
 install:
   - ps: Install-Product node $env:nodejs_version
-  - npm install -g npm
   - npm install
 test_script:
   # Output useful info for debugging.