atom-beta: 1.29.0-beta1 -> 1.30.0-beta1
The beta version jump seems like an irregular update, but 1.30.0-beta0
was retired rougly 3 hours after release due to an macOS error:
> Fixed an error about a missing string_decoder module when the Git pane
> is displayed on macOS.
This shouldn't affect the Linux x86_64 version, but latest versions are
always nice.
Also refactored the build script, it now takes the version number as
an extra (optional) argument and creates the version number from that.
Also removed `rec` from the main set because it was no longer needed.
e616563433