Strikethrough using tilde not working

[vwkd]

Strikethrough using single tilde ~ or double tilde ~~ don't work.

Example

import { render } from "https://deno.land/x/gfm/mod.ts";

console.log(render("hello ~world~"));
console.log(render("hello ~~world~~"));

Expected Output

<p>hello <del>world</del></p>

Actual Output

<p>hello world</p>

Notes

marked.js gives the correct output.

https://marked.js.org/demo/?outputType=html&text=hello%20~world~%0A%0Ahello%20~~world~~&version=4.0.12

[LeoDog896]

Should be fixed in #25 once merged