Support link to markdown headers in a Wikilink

[JesusTheHun]

I would like to reference some markdown documentation from code comments. Reference to files work, but not to a particular section of a markdown file.

// This link works fine : [[doc.md]]
// This one does not : [[doc.md#Introduction]]

Note that the anchor should support sluggification. At least [[doc.md#Getting Started]] and [[doc.md#getting-started]] should be supported.

[clutcher]

@JesusTheHun Would be included into next release.

[JesusTheHun]

@clutcher that's so cool mate, now I can reference the project's doc from the code 🚀