Upgrade styled-components. Fixes #1416 (#1422)

Author: timneutkens

examples/with-styled-components/package.json

@@ -10,7 +10,7 @@
     "next": "^2.0.0-beta",
     "react": "^15.4.2",
     "react-dom": "^15.4.2",
-    "styled-components": "1.2.1"
+    "styled-components": "^1.4.4"
   },
   "author": "",
   "license": "ISC"