Merge branch 'remove-trailing-slashes' into 'master'

Remove trailing slashes from gitlab_url

They do not play nice with gitlab-workhorse (or rather Golang net/http
DefaultServemux).

See merge request !35
2 jobs for master
Status Job ID Name Coverage
  Test
failed #395
ruby
rspec

failed #396
ruby
rubocop

 
Name Stage Failure
failed
rspec Test There is an unknown failure, please try again
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failed
rubocop Test There is an unknown failure, please try again
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