Dia 2.2.1 released

[Rob Gleeson]

Hi again,

Dia 2.2.1 has been released.
As indicated by the patch level, this release includes a bug fix, as well as some additions to the API.

* Fixed a bug that saw #e ( an alias for #exception ) always return nil.
#exception itself worked properly.

* #redirect_stderr, #redirect_stdout, and #rescue_exception are
have been added to the RubyBlock class and are documented as getters.
They're aliased as #redirect_stderr?, #redirect_stdout? and
#rescue_exception? respectively.

Rob
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