Added shorten command.

src/commands/utilities/shorten.ts

@@ -0,0 +1,25 @@
+import Command from '../../core/command';
+import { CommonLibrary } from '../../core/lib';
+import * as https from 'https';
+
+export default new Command({
+  description: 'Shortens a given URL.',
+  run: 'Please provide a URL.',
+  any: new Command({
+    async run($: CommonLibrary): Promise<any> {
+      https.get(
+        'https://is.gd/create.php?format=simple&url=' +
+          encodeURIComponent($.args[0]),
+        function (res) {
+          var body = '';
+          res.on('data', function (chunk) {
+            body += chunk;
+          });
+          res.on('end', function () {
+            $.channel.send(`<${body}>`);
+          });
+        },
+      );
+    },
+  }),
+});