Fix typo in Elixir CI template

vendor/gitlab-ci-yml/Elixir.gitlab-ci.yml

@@ -2,7 +2,7 @@
 # The image already has Hex installed. You might want to consider to use `elixir:latest`
 image: trenpixster/elixir:latest
 
-# Pic zero or more services to be used on all builds.
+# Pick zero or more services to be used on all builds.
 # Only needed when using a docker container to run your tests in.
 # Check out: http://docs.gitlab.com/ce/ci/docker/using_docker_images.html#what-is-service
 services: