CircleCI build error

[pixelastic]

A CircleCI build has failed with the following error:

Error: Command failed with exit code 1: cd /home/circleci/project && git push --set-upstream origin master
Warning: Permanently added the RSA host key for IP address '140.82.114.4' to the list of known hosts.
To github.com:pixelastic/maps-data.git
 ! [rejected]        master -> master (non-fast-forward)
error: failed to push some refs to 'git@github.com:pixelastic/maps-data.git'
hint: Updates were rejected because the tip of your current branch is behind
hint: its remote counterpart. Integrate the remote changes (e.g.
hint: 'git pull ...') before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.

More details on https://circleci.com/gh/pixelastic/maps-data/11
ping @pixelastic