Send error message when fetching timetable fails

src/index.ts

@@ -40,6 +40,15 @@ let fetchUpdates = () => {
         });
     } catch(e) {
         console.error(e);
+        try {
+            let embed = new Discord.MessageEmbed()
+                .setTitle('An error has occurred.')
+                .setDescription(`\`\`\`js\n${e}\`\`\``)
+                .setColor(0xff0000);
+            sendEmbed(embed);
+        } catch(e) {
+            console.error(e);
+        }
     }
 }