Do not escape any characters of a URL

[khos2ow]

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• This pull request fixes a bug.
• This pull request adds a feature.
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• This pull request introduces breaking change.

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Description

As part of escaping illegal Markdown characters, if there is any of them in the URL (such as _) they will get escaped too, which makes the URL unusable. (for example https://domain.com/foo\_bar.html is invalid URL).
This PR fixes the issue with introducing NormalizeURLs function which get executed after escape runs to normalize URL back.

Issues Resolved

Fixes #168

Checklist

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Tests

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• All tests pass when I run make test.

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