Some improvements in code and doc

Author: gitim

README.md

@@ -44,7 +44,7 @@ Called when the active row was released.
 - **onPressRow** (function)<br />
 `(key) => void`<br />
 Called when a row was pressed.
-- **refreshControl** (Object)<br />
+- **refreshControl** (element)<br />
 A RefreshControl that works the same way as a ScrollView's refreshControl.
 
 #### Methods

src/SortableList.js

@@ -21,7 +21,7 @@ export default class SortableList extends Component {
     sortingEnabled: PropTypes.bool,
     scrollEnabled: PropTypes.bool,
     horizontal: PropTypes.bool,
-    refreshControl: PropTypes.object,
+    refreshControl: PropTypes.element,
 
     renderRow: PropTypes.func.isRequired,
 
@@ -149,21 +149,18 @@ export default class SortableList extends Component {
     const {contentContainerStyle, horizontal, style: containerStyle} = this.props;
     const {contentHeight, contentWidth, scrollEnabled} = this.state;
     const innerContainerStyle = [styles.container];
-    let refreshControl = this.props.refreshControl;
+    let {refreshControl} = this.props;
 
     if (horizontal) {
       innerContainerStyle.push({width: contentWidth});
     } else {
       innerContainerStyle.push({height: contentHeight});
     }
 
-    if(refreshControl) {
-      refreshControl=(
-        <RefreshControl
-          {...this.props.refreshControl.props}
-          enabled={scrollEnabled}
-        />
-      )
+    if (refreshControl && refreshControl.type === RefreshControl) {
+      refreshControl = React.cloneElement(this.props.refreshControl, {
+        enabled: scrollEnabled, // fix for Android
+      });
     }
 
     return (