Picker - fix not responding to external value change when renderPicker is used (#1211)

* Picker - fix not responding to external value change when renderPicker is used

* Add prevValue to the state update

Author: M-i-k-e-l

generatedTypes/index.d.ts

@@ -99,6 +99,7 @@ export {
   WheelPickerProps,
   ColorPicker,
   Picker,
+  PickerItemValue,
   PickerProps
 } from '../typings';
 

src/components/picker/index.js

@@ -186,6 +186,11 @@ class Picker extends Component {
           value: nextProps.value
         };
       }
+    } else if (_.isFunction(nextProps.renderPicker) && prevState.value !== nextProps.value) {
+      return {
+        prevValue: prevState.value,
+        value: nextProps.value
+      };
     }
     return null;
   }