Upgrade postcss6

TrySound · TrySound · commit e34f7caed91c · 2017-05-20T22:58:18.000+03:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,9 +1,8 @@
-sudo: false
 language: node_js
 node_js:
-  - "0.12"
   - "4"
-  - "5"
+  - "6"
+  - "node"
 script: npm run travis
 
 before_install:
diff --git a/package.json b/package.json
@@ -38,7 +38,7 @@
   },
   "dependencies": {
     "icss-replace-symbols": "^1.0.2",
-    "postcss": "^5.0.14"
+    "postcss": "^6.0.1"
   },
   "babel": {
     "presets": [
