fix: iOS build error (#694)

ios/DatePicker.h

@@ -1,4 +1,5 @@
 #import <UIKit/UIKit.h>
+#import <React/RCTConvert.h>
 
 @interface DatePicker : UIDatePicker
 

ios/RNDatePickerManager.mm

@@ -3,18 +3,7 @@
 #import <React/RCTViewManager.h>
 
 #import "RNDatePickerManager.h"
-
-/**
- * Copyright (c) 2015-present, Facebook, Inc.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- */
-
-#import <React/RCTLog.h>
-
 #import "RCTConvert.h"
-
 #import "DatePicker.h"
 #import "RNDatePicker.h"