fix sub-host cli handling

bin/server

@@ -18,8 +18,7 @@ const argv = optimist
         describe: 'listen on this port for outside requests'
     })
     .options('sub-host', {
-        describe: 'additionally listen on these sub hosts for outside requests',
-        type: 'array'
+        describe: 'additionally listen on this sub host for outside requests (can use this option multiple times)'
     })
     .options('max-sockets', {
         default: 10,

server.js

@@ -50,6 +50,8 @@ function maybe_bounce(req, res, sock, head, opt) {
     let subdomain = tldjs.getSubdomain(hostname);
     
     if (subdomain && opt.subHost) {        
+        const subHosts = Array.isArray(opt.subHost)
+            ? opt.subHost : [opt.subHost]
         const subHost = opt.subHost.reduce((found, sub) => {                        
             return found
                 || (subdomain.slice(-sub.length) == sub ? sub : '')