Adding refresh interval to system load status

llamabot.js

@@ -197,7 +197,7 @@ async function generateResponse(conversation, message) {
     let time = 0
     // define a function that shows the system load percentage and updates the message
     const showSystemLoad = async () => {
-        time = time + 7;
+        time = time + process.env.REFRESH_INTERVAL;
         cpuStat.usagePercent(function(err, percent, seconds) {
           if (err) {
             return console.log(err);