Repository url paths should be versioned

[KnicKnic]

Rather than always give a url to master, give to the appropriate tree.

Example in project go-licenses I ran PS C:\Users\nmaliwa\go\src\github.com\google\go-licenses> .\go-licenses.exe csv .

we get output
github.com/spf13/cobra,https://github.com/spf13/cobra/blob/master/LICENSE.txt,Apache-2.0
we also know that it is tag v0.0.5
I would expect
github.com/spf13/cobra,https://github.com/spf13/cobra/blob/v0.0.5/LICENSE.txt,Apache-2.0

[dbaumgarten]

+1 for this. The guys from my legal departement want the license-link for the exact version of every open-source component I use.
If go-licenses would directly provide the correct link, that would be tremendously helpful.

[Bobgy]

Fixed in #94