Replace deprecated .Hugo with hugo. (#171)

* Add trailing slash to remove redirects.

When you request /tags/foo, the web server will redirect you to
/tags/foo/ so the browser needs to make two requests.  Add the trailing
slash in the link so that only one request is needed.

* Add trailing slash to remove redirects.

* Improve how trailing slash is added.

Co-Authored-By: tobinjt <johntobin@johntobin.ie>

* Improve how trailing slash is added.

Co-Authored-By: tobinjt <johntobin@johntobin.ie>

* Add John Tobin.

* Replace deprecated .Hugo with hugo.

Hugo 0.55 deprecates .Hugo and produces this warning:
"Page's .Hugo is deprecated and will be removed in a future release.
 Use the global hugo function."

* Bump version to brute-force figure out when "hugo" function was introduced because it is not documented.

* Bump version to brute-force figure out when "hugo" function was introduced because it is not documented.

* Bump version to brute-force figure out when "hugo" function was introduced because it is not documented.

* Bump version to brute-force figure out when "hugo" function was introduced because it is not documented.

* Bump version to brute-force figure out when "hugo" function was introduced because it is not documented.

* Update minimum required version.