Add HTTPie Discord link to README (#1016)
Add HTTPie Discord link to README (#1016)

* add discord link

* update link
PKRoma/httpie,jakubroztocil/httpie,jkbrzt/httpie,jakubroztocil/httpie,jkbrzt/httpie,jkbrzt/httpie,jakubroztocil/httpie,PKRoma/httpie