GitLabCI badges don't recognise hosting service

[judober]

I just created a module with GitLabCI using interactive_template() on a custom server (not gitlab.com).

I recognised that the badges (build and coverage) that were added automatically to the Readme didn't work. The error was that gitlab.com was used for the links and the custom server.

Original:

[![Coverage](https://gitlab.com/name/example.jl/badges/master/coverage.svg)](https://gitlab.com/name/example.jl/commits/master)

Fixed:

[![Coverage](https://customserver.com/name/example.jl/badges/master/coverage.svg)](https://customserver.com/name/example.jl/commits/master)