Update to draft-16 and bump the package version

Yes, we skipped -15. We're special like that. Bumped the package minor
revision as -16 is technically incompatible with -14, though we seem to
have been the only implementation that actually took that
incompatibility seriously :)

3.0.1 release

Merge pull request molnarg#70 from todesschaf/wip/draft13

Update for new version of http2-protocol

Merge pull request molnarg#24 from todesschaf/wip/draft13

Wip/draft13

Releasing 2.5.3

Releasing 0.12.3

Releasing version 2.5.2

Releasing 2.5.1

Releasing 0.12.2

Release of version 0.12.1