Fix default template missing newlines before links if doc ends with html

[LuckyTurtleDev]

The default template does not show links, if rust docs ends with html code.

This happen because there is now newline between doc and links, which cause some markdown renders like GitHub, to not interpret markdown.

Example generated README.md:

...
<div align="center">
		<img src="https://github.com/LuckyTurtleDev/mission2teegarden-b/assets/44570204/68403ebd-ce64-4baa-bba2-b52962b89d5c" width=80%>
 </div>
 [__cargo_doc2readme_dependencies_info]: ggGkYW0BYXSEGxZ8633wCs_9GzKKlc-jeF26G4eLyZuq8IdiG7yPhHI4iD8_YXKEGxvALrpccUwnG3LtwJOv_IT2G96ptTVep6W9G7qKrdEKLREhYWSBgndtaXNzaW9uMnRlZWdhcmRlbl9iX21hcGUwLjEuMA
...

[msrd0]

Thanks. No idea why that newline was missing.

[msrd0]

Can you fix the tests please?

[LuckyTurtleDev]

should this be a breaking change? Since cargo doc2readme --test will fail now at existing projects.

[msrd0]

Hm ... good question. For those that include the __cargo_doc2readme_dependencies_info pseudo-link, this change is not breaking. For readmes without links, this change is also not breaking. For those readmes that explicitly filter out that line it is breaking ... but I think I don't really care.