[release] 1.39.4 - BugFix: Racing updateUser calls (#263)

- Fixes and issue where if multiple updateUser calls were made for users
with the same IDs but different other fields (email, custom,
privateAttrb etc), the last network request to return would dictate the
values being used, regardless of the order of updateUser calls.





>Included In This Release
>- dff6c5b Daniel
>   - prevent inflight reqs getting out of order (#262)

Sources/Statsig/DeviceEnvironment.swift

@@ -7,7 +7,7 @@ struct DeviceEnvironment {
 
     static internal let deviceOS = PlatformCompatibility.deviceInfo.os
     static internal let sdkType: String = "ios-client"
-    static internal let sdkVersion: String = "1.39.3"
+    static internal let sdkVersion: String = "1.39.4"
 
     let lock = NSLock()
     var sessionID: String? { UUID().uuidString }

Statsig.podspec

@@ -1,7 +1,7 @@
 Pod::Spec.new do |spec|
 
   spec.name         = "Statsig"
-  spec.version      = "1.39.3"
+  spec.version      = "1.39.4"
   spec.summary      = "Statsig enables developers to ship code faster and more safely."
   spec.description  = <<-DESC
                    Statsig enables developers to ship code faster and more safely by providing: