chore(dependencies): update postcss to latest version

postcss was updated to version 6. BREAKING CHANGE: css-byebye will work from node v4 from now on. postcss@6 drops support for nodejs 0.12. This should normally not be a problem if you use recent versions of node, but it is a breaking change nonetheless. Links: https://github.com/postcss/postcss/releases/tag/6.0.0
AoDev · Mar 4, 2018 · b586ebf · b586ebf
1 parent 5bc9dc7
commit b586ebf
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diff --git a/.travis.yml b/.travis.yml
@@ -3,5 +3,6 @@ node_js:
   - "4"
   - "5"
   - "6"
-  - "0.12"
-  - "iojs"
+  - "7"
+  - "8"
+  - "9"