fix(package): update react-dropzone to version 6.0.2

Closes #226

Author: greenkeeper[bot]

package.json

@@ -63,7 +63,7 @@
     "react": "^16.0.0",
     "react-css-modules": "^4.7.1",
     "react-dom": "^16.0.0",
-    "react-dropzone": "^4.2.5",
+    "react-dropzone": "^6.0.2",
     "react-redux": "^5.0.6",
     "react-router-dom": "^4.2.2",
     "react-router-redux": "^5.0.0-alpha.6",