fix(package): update react-infinite-scroller to version 1.2.0

Closes #5

Author: greenkeeper[bot]

package.json

@@ -14,7 +14,7 @@
     "react": "16.2.0",
     "react-bootstrap": "0.31.5",
     "react-dom": "16.2.0",
-    "react-infinite-scroller": "1.1.2",
+    "react-infinite-scroller": "1.2.0",
     "react-scroll-up": "1.3.3",
     "react-spinners": "0.2.5"
   }