Replace [xxx] for (xxx) on links

[agnoldo]

Hello. First of all, thanks for the project, which is amazing, very useful.

Unfortunately some pages have titles with invalid characters for links in Markdown. An example:

🔥 Flowers for Algernon (1965) [pdf]

The title 'Flowers for Algernon (1965) [pdf]' is invalid and needs to be manually fixed later in a text editor.

It would be amazing if matcha was able to fix this automatically. Thanks.

[agnoldo]

One more thing: I tried to escape [xxx] but it didn´t work, neither '[xxx]' nor '[[xxx]]'.