fix(package): update react-spinners to version 0.8.1

Closes #9

Author: greenkeeper[bot]

package.json

@@ -16,6 +16,6 @@
     "react-dom": "16.2.0",
     "react-infinite-scroller": "1.1.2",
     "react-scroll-up": "1.3.3",
-    "react-spinners": "0.2.5"
+    "react-spinners": "0.8.1"
   }
 }