Update the changelog

@kini Once #173 is fixed, can you
1. merge this,
2. change the date, and
3. tag the current master as 0.10.7 (what is the command that you use to tag, btw?)

In the future, if we don't want to sift through the changes to pick out the major changes, then we can do something like this:

    git shortlog -n -w --since="1 week ago"