Show the last modified date of posts (#432)
Show the last modified date of posts (#432)

Merge pull request 432
horaceho/horaceho.github.io,jekyll/minima,cgerke/cgerke.github.io,Passw/Passw.github.io,Passw/Passw.github.io,cgerke/cgerke.github.io,Passw/Passw.github.io,jekyll/minima,horaceho/horaceho.github.io,horaceho/horaceho.github.io,jekyll/minima,cgerke/cgerke.github.io