Log Message:
Update ruby-commander to 4.3.0.

* pkgsrc change: add pkg_alternatives support.

=== 4.3.0 / 2015-02-07

* Drops support for Ruby 1.8. Please use 4.2.1 if you still need Ruby 1.8 \ 
compatibility.
* Fixed a bug with `always_trace` (#91) (@KrauseFx)
* Renamed `commands` to `defined_commands` for better compatibility with Pry

=== 4.2.1 / 2014-09-28

* Improve `choose` compatibility with HighLine's version (#79)

=== 4.2.0 / 2014-04-29

* Add ability to use commander without importing into the global namespace (#61) \ 
(@krissi)