add gobinaries link to the README

[mh-cbon]

Describe the bug

Just thought the README misses those two links/cmds for fast install

• curl -sf https://gobinaries.com/neilalexander/yggmail/cmd/yggmail | sh
• https://gobinaries.com/neilalexander/yggmail/cmd/yggmail?os=windows&arch=amd64&version=latest

but, for now it complains with

$ cat yggmail
echo
printf "  \033[38;5;125mError:\033[0;00m Repository has no tags\n"
echo
exit 1

https://gobinaries.com/

the windows link does not exactly produce a .exe, deal with it.