iOS How to get the current Ad SDK version

Below can be used to get this version information 

NSLog("Ad Mob request version :\(GADRequest.sdkVersion())")

this prints something like this below 

Ad Mob request version :afma-sdk-i-v7.57.0

references:

https://stackoverflow.com/questions/48203987/how-to-check-current-sdk-version-of-google-admob-ios