Update version

Author: ioannisj

CHANGELOG.md

@@ -1,5 +1,7 @@
 ## Next
 
+## 3.31.0 - 2025-08-29
+
 - feat: surveys GA ([#381](https://github.com/PostHog/posthog-ios/pull/381))
 > Note: Surveys are now enabled by default
 

PostHog.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name             = "PostHog"
-  s.version          = "3.30.1"
+  s.version          = "3.31.0"
   s.summary          = "The hassle-free way to add posthog to your iOS app."
 
   s.description      = <<-DESC

PostHog/PostHogVersion.swift

@@ -9,7 +9,7 @@ import Foundation
 
 // if you change this, make sure to also change it in the podspec and check if the script scripts/bump-version.sh still works
 // This property is internal only
-public var postHogVersion = "3.30.1"
+public var postHogVersion = "3.31.0"
 
 public let postHogiOSSdkName = "posthog-ios"
 // This property is internal only