Update .gitlab-ci.yml

3 jobs for master in 26 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Compile
passed #265515
job 0

00:00:07

 
  Test
passed #265516
job 1

00:00:09

 
  Deploy
failed #265517
job 2

00:00:09

 
Name Stage Failure
failed
job 2 Deploy
WARNING:  You don't have /var/lib/gitlab-runner/.gem/ruby/2.5.0/bin in your PATH,
gem executables will not run.
Successfully installed dpl-heroku-1.10.14
Parsing documentation for dpl-heroku-1.10.14
Done installing documentation for dpl-heroku after 0 seconds
1 gem installed
$ PATH = "$(ruby -r rubygems -e 'puts Gem.user_dir')/bin:$PATH"
bash: line 92: PATH: command not found
ERROR: Job failed: exit status 1