Fix to pass Travis

Author: adrianhurt

src/MasonryList.js

@@ -75,6 +75,9 @@ export type Props = {
    * sure to also set the `refreshing` prop correctly.
    */
   onRefresh?: ?Function,
+  wrapperStyle?: object,
+  columnWrapperStyle?: any,
+  verticalSeparatorWidth?: number,
 };
 type State = {
   columns: Array<Column>,