Fix wrong default iOS leading navigation button icon (#157)

* Fix typo where the wrong iOS system icon was being used

* Bump version

Author: JamieDass

ios/RNTPTDocumentView.m

@@ -217,7 +217,7 @@ - (void)loadDocumentViewController
         UIImage *navImage = [UIImage imageNamed:self.navButtonPath];
         UIBarButtonItem *navButton;
         if (navImage == nil) {
-            navButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:@selector(navButtonClicked)];
+            navButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemClose target:self action:@selector(navButtonClicked)];
         }else{
             navButton = [[UIBarButtonItem alloc] initWithImage:navImage
                                                          style:UIBarButtonItemStylePlain

package.json

@@ -1,7 +1,7 @@
 {
   "name": "react-native-pdftron",
   "title": "React Native Pdftron",
-  "version": "2.0.1-beta.21",
+  "version": "2.0.1-beta.22",
   "description": "React Native Pdftron",
   "main": "index.js",
   "scripts": {