Update .gitlab-ci.yml

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HEAD is now at 23f55f9 Update .gitlab-ci.yml
From https://gitlab.cba.mit.edu/calischs/nrf52
23f55f9..f57268b master -> origin/master
Checking out f57268b8 as master...
Skipping Git submodules setup
$ pip install grip
bash: line 46: pip: command not found
ERROR: Job failed: exit status 1