Bump up 3.4.1

Bump up v3.4.0

Version 3.3.4

Version 3.3.3

Version 3.3.2

Version 3.3.1

Version 3.3.0

Version 2.0.3

Version 3.2.2

Expose Date::VERSION

An almost universal convention for gems is to expose `Namespace::VERSION`
which makes it mcuh easier when debugging etc.

Many gems extracted from ruby don't do this, even though it would be even more
useful because they ship with ruby, so it's less clear which version it is.