Merge pull request #148 from css-modules/greenkeeper-postcss-5.1.2

Update postcss to version 5.1.2 🚀

Author: geelen

package.json

@@ -8,7 +8,7 @@
   },
   "dependencies": {
     "icss-replace-symbols": "1.0.2",
-    "postcss": "5.0.10",
+    "postcss": "5.1.2",
     "postcss-modules-values": "1.2.2",
     "postcss-modules-extract-imports": "1.0.0",
     "postcss-modules-local-by-default": "1.0.1",