HEAD should point to master instead of v3

[liuweichu]

For some reason, the HEAD is on v3 now, which only contains 3 old files.
A little bit confusing to starters
Maybe it is a mistake? I think it should be master.

[liuweichu]

Hmmmm, after a while I realized (guess) maybe the README means the starter kit is deprecated and one should use better-defaults?

[technomancy]

That's correct; v3 is the latest.