Merge branch 'remove_py2osx_builds' into 'master'

Remove Python 2 mac builds for the CI

Closes #157

See merge request !20
5 jobs for master in 42 minutes and 39 seconds (queued for 4 seconds)
Name Stage Failure
failed
build_linux_27 Build
(08:04:18.087) export CURL_CA_BUNDLE=/local/builds/beat/beat.editor/_ci/cacert.pem
(08:04:18.089)
export SSL_CERT_FILE=/local/builds/beat/beat.editor/_ci/cacert.pem
(08:04:18.092)
export GIT_SSL_CAINFO=/local/builds/beat/beat.editor/_ci/cacert.pem
(08:04:18.093)
export DOC_SERVER_PREFIX=public-upload/docs/beat/beat.editor
(08:04:18.095)
DOC_UPLOADS=public-upload/docs/beat/beat.editor/master/
(08:04:18.096)
export LANG=en_US.UTF-8
(08:04:18.097)
export LC_ALL=en_US.UTF-8
(08:04:18.098)
export MATPLOTLIBRC=/local/builds/beat/beat.editor/_ci
ERROR: Job failed: exit code 1