Update ruby-zeitwerk to 2.3.0.
2.3.0 (3 March 2020)
* Adds support for collapsing directories.
For example, if booking/actions/create.rb is meant to define
Booking::Create because the subdirectory actions is there only for
organizational purposes, you can tell Zeitwerk with collapse:
loader.collapse("booking/actions")
The method also accepts glob patterns to support standardized project
structures:
loader.collapse("*/actions")
Please check the documentation for more details.
* Eager loading is idempotent, but now you can eager load again after
reloading.
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