[WARNING - iOS 15] Update WireGuard to >=1.0.15-26 *before* updating to iOS 15

[Jason A. Donenfeld]

Hello list,

Due to buggy changes Apple has made to the Keychain on iOS 15, older
versions of WireGuard on iOS will *eat your VPN configurations* when
upgrading to iOS 15. This has been fixed by [1], which is now
available as of version ≥1.0.15-26. If you are still on iOS 14, before
updating to iOS 15, please remember to update the WireGuard app to
this latest version in the App Store.

Sorry for the hassle.

Jason

[1] https://git.zx2c4.com/wireguard-apple/commit/?id=03a59ff38e96fb3bb5dde2f15fe42198d1dfb995