Upgrade postcss6

Author: TrySound

.travis.yml

@@ -1,8 +1,8 @@
-sudo: false
 language: node_js
 node_js:
-  - "0.12"
-  - "4.0"
+  - "4"
+  - "6"
+  - "node"
 script: npm run travis
 
 before_install:

package.json

@@ -35,7 +35,7 @@
   "homepage": "https://github.com/geelen/postcss-modules-scope",
   "dependencies": {
     "css-selector-tokenizer": "^0.7.0",
-    "postcss": "^5.0.4"
+    "postcss": "^6.0.1"
   },
   "devDependencies": {
     "babel": "^5.4.7",