add host to ethsim options

remix-simulator/bin/ethsim

@@ -21,9 +21,10 @@ program
 
 program
   .option('-p, --port [port]', 'specify port')
+  .option('-b, --ip [host]', 'specify host')
   .parse(process.argv)
 
 const Server = require('../src/server')
 const server = new Server()
-server.start(program.port || 8545)
+server.start(program.host || '127.0.0.1', program.port || 8545)
 

remix-simulator/src/server.js

@@ -10,7 +10,7 @@ class Server {
     this.provider = new Provider()
   }
 
-  start (port) {
+  start (host, port) {
     expressWs(app)
 
     app.use(bodyParser.urlencoded({extended: true}))
@@ -40,7 +40,7 @@ class Server {
       })
     })
 
-    app.listen(port, () => log('Remix Simulator listening on port ' + port))
+    app.listen(port, host, () => log('Remix Simulator listening on port ' + host + ':' + port))
   }
 }