upgrade to Gatsby 0.11

gatsby-node.js

@@ -0,0 +1,13 @@
+var rucksack = require('rucksack-css')
+var lost = require("lost")
+
+exports.modifyWebpackConfig = function(config, env) {
+    config.merge({
+        postcss: [
+            lost(),
+            rucksack()
+        ]
+    })
+
+    return config
+};