Update History.md with all of the exciting new stuff I finally merged.
Update History.md with all of the exciting new stuff I finally merged.

Sorry everyone that some of these merges have taken so long for me to
get around to. I'm well aware docker has been a bit neglected recently.
I'm planning on picking up work on my v0.3 branch, which'll be a
substantial rewrite to swap Showdown for marked, Pygments for
highlight.js or atom/highlights, and other improvements like using toc
for heading linkerizing.

jbt/docker,jbt/docker