rename yandex-disk.rb to yandexdisk.rb

in accordance with `cask_namer` and `CASK_NAMING_REFERENCE.md`
Upgrade WebStorm.app to v8.0

Updated WebStorm cask to version 8.0
Added Messenger-for-Telegram.app (Latest)

Previously managed in caskroom-versions, no version-less :)
Merge pull request #3683 from fharbe/telegram

Added Messenger-for-Telegram.app (Latest)
Merge pull request #3682 from nwinkler/webstorm-8

Upgrade WebStorm.app to v8.0
Merge pull request #3679 from rolandwalker/yandex_disk_rename

rename yandex-disk.rb to yandexdisk.rb