Show message when successfully logged in
So that we know the credentials were correct even if the initial sync is taking
forever.
Fix Makefile prerequisites
Remove superfluous cmd.Add()
Add a simple Makefile for compiling
Bump dependencies
go get -v -t -u ./..
go mod tidy
Switch from cmdtab to cmdbox
The latter is a rewrite of the former by the same author.
> CmdBox originally started as cmdtab and was used for more than two years
> before Rob realized BusyBox was even a thing. The name was changed when it
> became clear just how close to BusyBox CmdBox is in approach and purpose, even
> if the design and implementation are completely different.
https://github.com/rwxrob/cmdbox#does-this-have-anything-to-do-with-busybox
deletemsgs: clarify summary
echo: create filter limited to room when room ID is provided
deletemymsgs: allow passing -a flag to delete all messages
not just the ones we sent.
This is useful if we're the admin of the room and need to quickly batch delete.
echo: fix formatting of usage string
README: add description of what the program does on invocation
README: better usage instructions
README: fix mailto link formatting
README: add instructions for go get