Battle for Wesnoth cask is currently using develop version

Verification

[X] I understand that if I ignore these instructions, my issue may be closed without review.
[X] I have retried my command with --force.
[X] I ran brew update-reset && brew update and retried my command.
[X] I ran brew doctor, fixed as many issues as possible and retried my command.
[X] I have checked the instructions for reporting bugs.
[X] I made doubly sure this is not a checksum does not match error.

Description of issue

Battle for Wesnoth uses an even is stable, odd is dev versionning scheme. Currently, the last stable version is 1.16.2, while on homebrew it is 1.17.0, which I as just explained is the dev version.

To avoid this kind of errors in the future, the livecheck in https://github.com/Homebrew/homebrew-cask/blob/master/Casks/the-battle-for-wesnoth.rb could become something along the lines of regex(href=.*?Wesnoth[._-]v?(\d+(?:\.\d*[02468])+(?:\.\d+)*[a-z]?)\.dmg/i, which should have the expected behaviour.

Command that failed

none

Output of command with `--verbose --debug`

none

Output of `brew doctor --verbose`

none

Output of `brew tap`

none

Homebrew / homebrew-cask