chore(package): update styled-components to version 4.4.1

Closes #14

Author: greenkeeper[bot]

package.json

@@ -66,7 +66,7 @@
     "react-router-dom": "^4.2.2",
     "regenerator-runtime": "^0.11.1",
     "storybook-react-router": "^1.0.1",
-    "styled-components": "^3.2.6",
+    "styled-components": "^4.4.1",
     "web-animations-js": "^2.3.1"
   },
   "dependencies": {},