Updates SMS module for new Plivo structure (#41)

Thanks @ribordy

lib/bot/send-sms.js

@@ -8,29 +8,18 @@ async function sendSms (to, message, from = PLIVO_NUMBER) {
   if (!enabled || to == null) return false;
 
   const plivo = getPlivo();
-  const params = {
-    src: from,
-    dst: to,
-    text: message
-  };
-
-  return new Promise(resolve => {
-    plivo.send_message(params, function (status, res) {
-      console.log('Status: ' + status);
-      console.log(res);
-      resolve({
-        status,
-        res
-      });
-    });
-  });
+  try {
+    response = await plivo.messages.create(from, to, message);
+    console.log(response);
+    return response;
+  } catch (error) {
+    console.error(error);
+    return false;
+  }
 }
 
 function getPlivo () {
-  return Plivo.RestAPI({
-    authId: PLIVO_ID,
-    authToken: PLIVO_TOKEN
-  });
+  return new Plivo.Client(PLIVO_ID, PLIVO_TOKEN);
 }
 
 module.exports = {