fix(package): update styled-components to version 5.1.0

Closes #160

Author: greenkeeper[bot]

package.json

@@ -9,7 +9,7 @@
     "react-router-dom": "5.1.0",
     "react-syntax-highlighter": "^10.3.5",
     "redux": "4.0.1",
-    "styled-components": "^4.3.1",
+    "styled-components": "^5.1.0",
     "uuid": "3.3.3"
   },
   "scripts": {