auto-increment copyright year in docs

I've noticed a few commits (d470a1009058a02706c53379c5019ad43ed924e1, 5b5bcc95eb3abb025b9d4124266a54b8bc212c50) where the README was being tweaked manually to update the copyright year only for `make build` to revert it back to 2010. This pull request should fix that issue.

As I've mentioned in #79, running the build modifies a bunch of code that is outside the scope of the pull request. I would feel much better about committing the build files if an updated build was run on master.