upgrade testing node versions

Author: Elexy

.travis.yml

@@ -8,28 +8,31 @@ env:
 
 matrix:
  include:
+ - node_js: "lts/boron"
+ addons:
+ postgresql: "9.6"
  - node_js: "lts/argon"
  addons:
  postgresql: "9.6"
- - node_js: "lts/boron"
+ - node_js: "9"
+ addons:
+ postgresql: "9.6"
+ - node_js: "lts/carbon"
  addons:
  postgresql: "9.1"
  dist: precise
- - node_js: "lts/boron"
+ - node_js: "lts/carbon"
  addons:
  postgresql: "9.2"
- - node_js: "lts/boron"
+ - node_js: "lts/carbon"
  addons:
  postgresql: "9.3"
- - node_js: "lts/boron"
+ - node_js: "lts/carbon"
  addons:
  postgresql: "9.4"
- - node_js: "lts/boron"
+ - node_js: "lts/carbon"
  addons:
  postgresql: "9.5"
- - node_js: "lts/boron"
- addons:
- postgresql: "9.6"
- - node_js: "8"
+ - node_js: "lts/carbon"
  addons:
  postgresql: "9.6"