downloaded to Google play store and they accepted app but they said app had some small issues.So went back and fixed the issues tried to download again to Google play store and now they say I need a min sdk version 21 that I only have a min sdk version 19. I don't know why this is happening
If any one knows why this happened I could use the help thank you.
thanks to both of you for your help .I will try both of these great advices.
I think your both right .I am going to add the extension from Anke and I do remember hitting the Automatic Protection when I uploaded my app in Google console.Thanks for the help.