Update alabaster to 0.7.13#921

pyup-bot wants to merge 1 commit intodevelopStuartJSquires/markov_slackbot:developfrom

pyup-update-alabaster-0.7.8-to-0.7.13StuartJSquires/markov_slackbot:pyup-update-alabaster-0.7.8-to-0.7.13Copy head branch name to clipboard