Typo in license deactivation notice

[andrewjmead]

When deactivating a license from the Freemius admin page, I see the following notice:

It starts with O.K which should probably be OK or something like OK!. This comes from:

https://github.com/Freemius/wordpress-sdk/blob/master/includes/class-freemius.php#L21709

The activation messages started with Yee-Haw! Your license... so something like OK! Your license... with an exclamation mark would match that.

Thanks for considering this change. I understand we can tweak it with override_i18n, but I still wanted to bring it up as a possible change to the SDK itself.