Update README with new version number

Summary: Now that v5.0.0 has officially been pushed to CocoaPods, we can officially update the README with the new version numbers. 🎉

Differential Revision: D58096617

fbshipit-source-id: 77c2d9363f1cd06d02fe77798d4447f148a5b049

README.md

@@ -48,15 +48,15 @@ We use the open source version `main` branch in the Instagram app.
 The preferred installation method is with [CocoaPods](https://cocoapods.org). Add the following to your `Podfile`:
 
 ```ruby
-pod 'IGListKit', '~> 4.0.0'
+pod 'IGListKit', '~> 5.0.0'
 ```
 
 ### Carthage
 
 For [Carthage](https://github.com/Carthage/Carthage), add the following to your `Cartfile`:
 
 ```ogdl
-github "Instagram/IGListKit" ~> 4.0.0
+github "Instagram/IGListKit" ~> 5.0.0
 ```
 
 ### Swift Package Manager

README.zh.md

@@ -47,15 +47,15 @@
 推荐使用[CocoaPods](https://cocoapods.org)来进行安装，只需添加如下语句到你的`Podfile`文件中:
 
 ```ruby
-pod 'IGListKit', '~> 4.0.0'
+pod 'IGListKit', '~> 5.0.0'
 ```
 
 ### Carthage
 
 对于[Carthage](https://github.com/Carthage/Carthage), 添加如下到`Cartfile`文件中:
 
 ```ogdl
-github "Instagram/IGListKit" ~> 3.0
+github "Instagram/IGListKit" ~> 5.0.0
 ```
 
 > 对于高级用法, 查阅 [安装指南](https://instagram.github.io/IGListKit/installation.html)。