add ability to change progress update interval (#289)

* added progressUpdateInterval prop iOS

* add prop to Video.js

* added progressUpdateInterval prop iOS

* add prop to Video.js

ios/RCTVideo.m

@@ -636,6 +636,11 @@ static NSString *const playbackRate = @"rate";
     }
 }
 
+- (void)setProgressUpdateInterval:(float)progressUpdateInterval
+{
+  _progressUpdateInterval = progressUpdateInterval;
+}
+
 - (void)removePlayerLayer
 {
     [_playerLayer removeFromSuperlayer];

ios/RCTVideoManager.m

@@ -54,6 +54,7 @@ RCT_EXPORT_VIEW_PROPERTY(rate, float);
 RCT_EXPORT_VIEW_PROPERTY(seek, float);
 RCT_EXPORT_VIEW_PROPERTY(currentTime, float);
 RCT_EXPORT_VIEW_PROPERTY(fullscreen, BOOL);
+RCT_EXPORT_VIEW_PROPERTY(progressUpdateInterval, float);
 
 - (NSDictionary *)constantsToExport
 {