Update Travis CI node_js 6, 8, 10, node

Author: Arttse

.travis.yml

@@ -1,17 +1,13 @@
 language: node_js
 node_js:
-  - "8"
-  - "7"
-  - "6"
-  - "5"
-  - "4"
-  - "iojs"
-  - "0.12"
-  - "0.10"
-install:
-  - npm install
+  - node
+  - 10
+  - 8
+  - 6
+after_success:
+  - npm run coveralls
 cache:
   directories:
     - $HOME/.npm
 notifications:
-  email: false
+  email: false