add 1.15 elytra activation

[3lit3-Pl4y3r]

joining as versions 1.15+ wont let you glide immediately after jumping cuz of the client. but in actual 1.15 and above, the client allows you to glide immediately after jumping without needing to fall.

[Cirsius]

ok thanks. this will be added in viac 2.

also youre experiencing what you would experience if you just set the client version as 1.12 right?