Merge pull request #1176 from QuickBlox/support_ios_13

QuickBlox SDK 2.17.4

Author: IlliaChemolosov

Framework/Quickblox.framework/Headers/Quickblox.h

@@ -59,5 +59,5 @@
 #import "QBUpdateUserParameters.h"
 #import "QBUUser.h"
 
-/// Framework version 2.17.3
+/// Framework version 2.17.4
 FOUNDATION_EXPORT NSString * const QuickbloxFrameworkVersion;