Add method for handling OpenVPN log to the adapter delegate

OpenVPN Adapter/OpenVPNAdapter+Public.h

@@ -34,6 +34,9 @@ NS_SWIFT_NAME(handle(event:message:));
 - (void)handleError:(nonnull NSError *)error
 NS_SWIFT_NAME(handle(error:));
 
+- (void)handleLog:(nonnull NSString *)logMessage
+NS_SWIFT_NAME(handle(logMessage:));
+
 @end
 
 @interface OpenVPNAdapter (Provider)

OpenVPN Adapter/OpenVPNAdapter.mm

@@ -248,8 +248,10 @@ static void socketCallback(CFSocketRef socket, CFSocketCallBackType type, CFData
 }
 
 - (void)handleLog:(const ClientAPI::LogInfo *)log {
+    NSAssert(self.delegate != nil, @"delegate property should not be nil");
+    
     NSString *message = [NSString stringWithCString:log->text.c_str() encoding:NSUTF8StringEncoding];
-    NSLog(@"%@", message);
+    [self.delegate handleLog:message];
 }
 
 - (OpenVPNEvent)getEventIdentifierByName:(NSString *)eventName {