Update Gemfile.lock to include jekyll-feed
Update Gemfile.lock to include jekyll-feed

Anderson-Lab/anderson-lab.github.io,Twimlhook/twimlhook.github.io,edhlily/edhlily.github.io,stanlazy/stanlazy.github.io,stanlazy/stanlazy.github.io,codelec/codelec.github.io,Twimlhook/twimlhook.github.io,PACO-CPU/paco-cpu,codelec/codelec.github.io,Anderson-Lab/anderson-lab.github.io,emilyreese/pizza-a-week,stanlazy/stanlazy.github.io,Anderson-Lab/anderson-lab.github.io,edhlily/edhlily.github.io,emilyreese/pizza-a-week,Anderson-Lab/anderson-lab.github.io,Anderson-Lab/anderson-lab.github.io,PACO-CPU/paco-cpu,vsivaner/research,PACO-CPU/paco-cpu,vsivaner/research,vsivaner/research,Twimlhook/twimlhook.github.io,codelec/codelec.github.io,edhlily/edhlily.github.io,emilyreese/pizza-a-week