Update icon-gitlab.html - Added the missing forward slash from the url. (#80)
Update icon-gitlab.html - Added the missing forward slash from the url. (#80)

The missing `/` was causing the url to be incorrect in the finally generated web page.
The url got rendered as https://gitlab.comusername instead of https://gitlab.com/username
marcosramon/marcosramon.github.io,mmistakes/jekyll-theme-basically-basic,marcosramon/marcosramon.github.io,mmistakes/jekyll-theme-basically-basic,mmistakes/jekyll-theme-basically-basic,marcosramon/marcosramon.github.io