Add node v7-10 to ci test targets.

Author: sttk

.travis.yml

@@ -3,6 +3,10 @@ sudo: false
 language: node_js
 
 node_js:
+  - '10'
+  - '9'
+  - '8'
+  - '7'
   - '6'
   - '5'
   - '4'
@@ -13,3 +17,4 @@ after_success: 'npm run coveralls'
 
 os:
   - linux
+  - osx

appveyor.yml

@@ -4,6 +4,10 @@
 environment:
   matrix:
     # node.js
+    - nodejs_version: "10"
+    - nodejs_version: "9"
+    - nodejs_version: "8"
+    - nodejs_version: "7"
     - nodejs_version: "6"
     - nodejs_version: "5"
     - nodejs_version: "4"