Update README.md

Add Carthage & CocoaPods badges

Author: Grzegorz Pstrucha

README.md

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 # FBMemoryProfiler
+[![Carthage compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat)](https://github.com/Carthage/Carthage)
+[![CocoaPods](https://img.shields.io/cocoapods/v/FBMemoryProfiler.svg?maxAge=2592000)]()
+
 
 An iOS library providing developer tools for browsing objects in memory over time, using [FBAllocationTracker](https://github.com/facebook/FBAllocationTracker) and [FBRetainCycleDetector](https://github.com/facebook/FBRetainCycleDetector).