chore: update readme

Author: sohobloo

README.md

@@ -19,6 +19,9 @@ You can find them in the example.
 
 ## Update History
 
+### v0.6.2
+- Fix [#139](https://github.com/sohobloo/react-native-modal-dropdown/issues/139) `renderButtonText` renders \[object Object] if there is a call to `setState` in `onSelect` or `renderButtonText` functions
+
 ### v0.6.1
 - Fix [#127](https://github.com/sohobloo/react-native-modal-dropdown/issues/127) `renderButtonText` does not work on `select(idx)`  (Thanks to [@swb2016](https://github.com/swb2016))
 - Code optimization.

example/ModalDropdown.js

@@ -91,7 +91,7 @@ export default class ModalDropdown extends Component {
   componentWillReceiveProps(nextProps) {
     let {buttonText, selectedIndex} = this.state;
     const {defaultIndex, defaultValue, options} = nextProps;
-    buttonText = this._nextValue == null ? buttonText : this._nextValue.toString();
+    buttonText = this._nextValue == null ? buttonText : this._nextValue;
     selectedIndex = this._nextIndex == null ? selectedIndex : this._nextIndex;
     if (selectedIndex < 0) {
       selectedIndex = defaultIndex;
@@ -373,10 +373,11 @@ export default class ModalDropdown extends Component {
     const {onSelect, renderButtonText, onDropdownWillHide} = this.props;
     if (!onSelect || onSelect(rowID, rowData) !== false) {
       highlightRow(sectionID, rowID);
-      this._nextValue = rowData;
+      const value = renderButtonText && renderButtonText(rowData) || rowData.toString();
+      this._nextValue = value;
       this._nextIndex = rowID;
       this.setState({
-        buttonText: renderButtonText && renderButtonText(rowData) || rowData.toString(),
+        buttonText: value,
         selectedIndex: rowID
       });
     }