Fix linkify example code in README

[pocke]

This pull request updates an example code of Linkify in README. Because it does not work correctly.

Problem

The example said "disables .py as top level domain" by md.linkify.tlds('.py', false), but it is not correct.

It actually disables all top-level domains, except ..py. So, with the configuration, linkify doesn't convert foo.py to a link, but it also doesn't convert github.com and so on. But it converts foo..py to a link accidentally. 😂

Why it happens

The example misunderstood the behavior of linkify-it's tlds function.
http://markdown-it.github.io/linkify-it/doc/#LinkifyIt.prototype.tlds

The second argument is "keepOld".

merge with current list if true (false by default)

So, if it is false, the function replaces the whole of the current list with ['.py']. It means it only allows ..py domain.

Solutoon

I replaced the wrong example with another example that disables converting emails.
I think disabling email conversion is not a rare setting, so it is appropriate.

By the way, I couldn't find an easy way to disable .py TLD. I guess we need the following code for this, but it isn't smart for me.

md.linkify.tlds(allTopLevelDomainList.filter((tld) => tld !== 'py'), false)

So I changed the example from disabling .py.

[puzrin]

Thanks for clarification.

Anyway, it was not good idea to cut basic domains. But if you really need this feature - create issue with your reasons in linkify-it tracker, and i will try to help.

[pocke]

Anyway, it was not good idea to cut basic domains. But if you really need this feature - create issue with your reasons in linkify-it tracker, and i will try to help.

Thank you, but now I do not need this feature because I noticed my application doesn't need to convert URL without a scheme to a link. So I will not open an issue.

Thanks for merging and the offer to help!