add iOS微信内存监控

Author: skyming

README.md

@@ -33,6 +33,7 @@
 #### 内存优化
 * [Memory Usage Performance Guidelines](https://developer.apple.com/library/content/documentation/Performance/Conceptual/ManagingMemory/ManagingMemory.html#//apple_ref/doc/uid/10000160i) 
 * [探索iOS内存分配](https://juejin.im/post/5a5e13c45188257327399e19) 
+* [iOS微信内存监控](http://wetest.qq.com/lab/view/367.html?from=content_juejin)
 
 #### 卡顿优化
 * [微信iOS卡顿监控系统](http://mp.weixin.qq.com/s?__biz=MzAwNDY1ODY2OQ%3D%3D&idx=1&mid=207890859&scene=23&sn=e98dd604cdb854e7a5808d2072c29162&srcid=0921FzoCw9j1W7n4uFYKuarC#rd)