Vendor girc differently and upgrade dependencies
weather: cover more duplicate cases
weather: drop duplicate location string stems
Update README.md
urlpreview: User agent overrides
Set user agent
Use Handlers.Add for the help handler & go fmt
urlpreview: Parse Content-Disposition

Implements: https://todo.sr.ht/~handlerug/handlebot/15
Touch code

Touch me harder~~
Print panics to the log

girc's default panic handler prints panics only if debugWriter is set to
nil (and then girc sets it to io.Discard). It literally writes panics to
io.Discard if you set it to io.Discard, so make it nil by the default.
Move bot's version to a separate constant
Upgrade dependencies
urlparse: only do a GET request