[SoundAnalysis] Add Xcode11 Beta 5 binding (#6705)

* added error element

* Update src/soundanalysis.cs

Co-Authored-By: Alex Soto <alex@alexsoto.me>

src/soundanalysis.cs

@@ -30,6 +30,7 @@ namespace SoundAnalysis {
 		OperationFailed,
 		InvalidFormat,
 		InvalidModel,
+		InvalidFile,
 	}
 
 	[Watch (6, 0), TV (13, 0), Mac (10, 15), iOS (13, 0)]