Update PIXAPIHandler.m
Update PIXAPIHandler.m

在 -(void)callAPI:(NSString *)apiPath httpMethod:(NSString *)httpMethod shouldAuth:(BOOL)shouldAuth shouldExecuteInBackground:(BOOL)backgroundExec uploadData:(NSData *)uploadData parameters:(NSDictionary *)parameters timeoutInterval:(NSTimeInterval)timeoutInterval requestCompletion:(PIXHandlerCompletion)completion  加入 client_id 這個 parameter
pixnet/pixnet-ios-sdk,pixnet/pixnet-ios-sdk