Update OpenShift exmaple

examples/openShiftWebHook.js

@@ -1,11 +1,15 @@
+// An example for OpenShift platform.
 var TelegramBot = require('node-telegram-bot-api');
 
 var token = 'YOUR_TELEGRAM_BOT_TOKEN';
+// See https://developers.openshift.com/en/node-js-environment-variables.html
 var port = process.env.OPENSHIFT_NODEJS_PORT;
 var host = process.env.OPENSHIFT_NODEJS_IP;
+var domain = process.env.OPENSHIFT_APP_DNS;
 
 var bot = new TelegramBot(token, {webHook: {port: port, host: host}});
-bot.setWebHook('myapp-yagop.rhcloud.com:443/bot'+token);
+// OpenShift enroutes :443 request to OPENSHIFT_NODEJS_PORT
+bot.setWebHook(domain+':443/bot'+token);
 bot.on('message', function (msg) {
   var chatId = msg.chat.id;
   bot.sendMessage(chatId, "I'm alive!");