Verify `appcast`s with hostname different from `homepage`, and add comment

[vitorgalvao]

Refs #17499.

Casks that need it:

In caskroom/cask:

• [ ] actotracker
• [ ] aether
• [x] air-video-server-hd
• [x] airfile
• [ ] alcatraz
• [x] aliwangwang
• [ ] aluxian-messenger
• [ ] angry-ip-scanner
• [x] antetype
• [x] anvil
• [ ] apm-planner
• [ ] appserver
• [ ] aptanastudio
• [ ] aquamacs
• [x] atom
• [ ] audio-hijack
• [x] audiomate
• [x] batchmod
• [x] beardedspice
• [x] beotsmusic
• [x] biba
• [x] bit-slicer
• [x] bleep
• [ ] blink1control
• [x] blocs
• [x] blueharvest
• [ ] boot2docker-status
• [ ] borgbackup
• [x] bowtie
• [x] boxcryptor
• [ ] brackets
• [ ] brave
• [x] cactus
• [ ] calibre
• [x] cartographica
• [x] catch
• [ ] ccmenu
• [ ] cdock
• [x] changes
• [ ] chat
• [x] cheatsheet
• [x] chronicle
• [x] clarify
• [ ] cleanmymac
• [x] clementine
• [x] clipmenu
• [x] clusters
• [x] coccinellida
• [x] cog
• [x] connected-desktop
• [ ] coteditor
• [ ] couchpotato
• [x] crashlytics
• [ ] creepy
• [ ] cryptol
• [x] daemon-tools-lite
• [ ] darktable
• [x] delibar
• [x] devonthink-pro-office
• [x] devonthink-pro
• [ ] docker-compose
• [ ] docker
• [ ] dockertoolbox
• [ ] dogecoin
• [x] duet
• [x] edgeview
• [ ] eintopf
• [x] electron
• [x] eloquent
• [ ] encryptr
• [x] enjoy
• [x] espionage
• [x] eve
• [ ] exa
• [x] favs
• [x] feeds
• [ ] fenix
• [ ] fission
• [x] fivedetails-flow
• [x] flash-decompiler-trillix
• [x] flashlight
• [x] flixster-desktop
• [x] flowdock
• [ ] foldingtext
• [ ] freesmug-chromium
• [ ] gingr
• [ ] gitup
• [x] glueprint
• [x] gmail-notifr
• [ ] goldencheetah
• [x] goofy
• [ ] google-refine
• [ ] googleappengine
• [ ] graphicconverter
• [ ] gureumkim
• [x] hachidori
• [ ] hacker-menu
• [x] hammerspoon
• [x] hex-fiend
• [x] hive
• [x] hypo
• [x] ibettercharge
• [x] ibrowse
• [x] identify
• [ ] imageplay
• [ ] imazing
• [x] inssider
• [x] itsycal
• [ ] jd-gui
• [ ] kakapo
• [x] kaleidoscope
• [ ] kanmusmemory
• [ ] kitematic
• [x] kiwi
• [ ] knock
• [x] lifeslice
• [x] lightpaper
• [ ] lighttable
• [ ] lincastor
• [x] livereload
• [ ] lmms
• [x] loadmytracks
• [ ] mac2imgur
• [x] macdown
• [x] macpaw-gemini
• [x] macscale
• [x] malwarebytes-anti-malware
• [ ] mancy
• [x] marked
• [ ] medis
• [x] meocloud
• [ ] metanota
• [x] midikeys
• [x] minbox
• [x] minco
• [ ] mirador
• [x] miro-video-converter
• [ ] mirrordisplays
• [ ] mjolnir
• [x] mongodb
• [ ] moscow-ml
• [x] mpfreaker
• [x] mplayer-osx-extended
• [ ] mplayerx
• [ ] mpv
• [ ] multidoge
• [x] multifirefox
• [ ] mumble
• [ ] munki
• [ ] narodmon
• [x] neofinder
• [x] netnewswire
• [x] netshade
• [ ] nicecast
• [x] night-owl
• [ ] nulloy
• [ ] nvalt
• [ ] nzbget
• [ ] obs
• [ ] oclint
• [ ] onionshare
• [ ] oolite
• [x] opendns-updater
• [ ] openemu
• [ ] openra
• [ ] orelord-mongodb
• [ ] p5
• [ ] paintcode
• [ ] panconvert
• [ ] pandoc
• [ ] particle-dev
• [ ] pdfsam-basic
• [ ] piezo
• [ ] pinta
• [ ] pixelapse
• [ ] pki-io
• [ ] plover
• [ ] pollev-presenter
• [ ] pomotodo
• [ ] postgres
• [ ] praat
• [ ] principle
• [ ] prismatik
• [ ] pritunl
• [ ] psychopy
• [ ] purescript
• [ ] qmind
• [ ] qtpass
• [ ] querious
• [ ] rapidweaver
• [ ] raven
• [ ] rdm
• [ ] recordit
• [ ] reeddit
• [ ] renamer
• [ ] retroshare
• [x] rowanj-gitx
• [ ] satellite-eyes
• [ ] screenflick
• [ ] screenhero
• [ ] sequel-pro
• [ ] shotcut
• [ ] sidestep
• [ ] sigil
• [ ] silverback
• [ ] simpholders
• [ ] simple-sync
• [ ] slack
• [ ] slate
• [ ] sleipnir
• [ ] sling
• [ ] slingplayer-desktop
• [ ] smaller
• [ ] sony-ericsson-bridge
• [ ] sookasa
• [ ] sourcedrop
• [ ] spacemonkey
• [ ] sparkle
• [ ] spek
• [ ] spotdox
• [ ] spotify-notifications
• [ ] sqlitebrowser
• [ ] squire
• [ ] stand
• [ ] stretchlink
• [ ] strongvpn-client
• [ ] studio-link-plugin
• [ ] subtitle-master
• [ ] synalyze-it-pro
• [ ] syncmate
• [ ] syncthing
• [ ] tabula
• [ ] tactor
• [ ] tagaini-jisho
• [ ] tagoman
• [ ] tagspaces
• [ ] teitoku
• [ ] textsoap
• [ ] tiled
• [ ] time-relic
• [ ] toau
• [ ] tomighty
• [ ] tower
• [ ] track-o-bot
• [ ] trailrunner
• [ ] transporter-desktop
• [ ] tranzport
• [ ] tribler
• [ ] tubbler
• [ ] tuneup
• [ ] tunnelbear
• [ ] tvrenamer
• [ ] twitterrific
• [ ] ukelele
• [ ] unsplash-wallpaper
• [ ] vagrant-manager
• [ ] versions
• [ ] vimr
• [ ] visualack
• [ ] vitalsource-bookshelf
• [ ] vox-preferences-pane
• [ ] vox
• [ ] vpaint
• [ ] whatsize
• [ ] wordcounter
• [ ] world-of-tanks
• [ ] xld
• [ ] xquartz
• [ ] xslimmer

In caskroom/versions:

• [ ] atom-beta
• [ ] boot2docker-status-beta
• [ ] openemu-experimental
• [ ] tower-beta

In caskroom/fonts:

• [ ] font-amiri
• [ ] font-hack
• [ ] font-koruri

[vitorgalvao]

Updated with full list, for all repos.

[vitorgalvao]

Closing in favour of https://github.com/caskroom/homebrew-cask/pull/18051.