Change Readme for iOS install

[hmunoz]

new version rabbit AMQP for ObjectC https://github.com/rabbitmq/rabbitmq-objc-client.git now It is not necessary change this fixes: @import JKVValue; to

import "JKVValue.h"

import <JKVValue/JKVValueImpl.h>

import <JKVValue/JKVMutableValue.h>

import <JKVValue/JKVObjectPrinter.h>

import <JKVValue/JKVFactory.h>

to

import "JKVValueImpl.h"

import "JKVMutableValue.h"

import "JKVObjectPrinter.h"

import "JKVFactory.h"

@import CocoaAsyncSocket; to

import "GCDAsyncSocket.h"