added 'login' directive for github.com/tarent/loginsrv/caddy (#1648)

caddyhttp/httpserver/plugin.go

@@ -468,6 +468,7 @@ var directives = []string{
 	"status",
 	"cors", // github.com/captncraig/cors/caddy
 	"mime",
+	"login",     // github.com/tarent/loginsrv/caddy
 	"jwt",       // github.com/BTBurke/caddy-jwt
 	"jsonp",     // github.com/pschlump/caddy-jsonp
 	"upload",    // blitznote.com/src/caddy.upload