Add support fox tsx files

[nistvan86]

Debowerify doesn't process tsx files.

Modifying the following line in index.js
if (!/\.(_?js|c?jsx|(lit)?coffee(\.md)?|ls|ts)$/.test(file)) return through();
to this
if (!/\.(_?js|c?jsx|(lit)?coffee(\.md)?|ls|ts|tsx)$/.test(file)) return through();
fixes the issue.