Support the upcoming TZInfo v2.0.0 release

[philr]

I'm the maintainer of the tzinfo gem. et-orbi currently depends on tzinfo with open-ended version constraints.

I'm working on a new major release of tzinfo (v2.0.0), which I hope to release sometime in the coming months. This will break backwards compatibility in a few ways that affect et-orbi:

• The TimezonePeriod#to_local and TimezonePeriod#to_utc methods have been removed. Timezone#utc_to_local and Timezone#local_to_utc should be used instead.
• TZInfo::TransitionDataTimezoneInfo has been replaced with TZInfo::DataSources::ConstantOffsetDataTimezoneInfo and TZInfo::DataSources::TransitionsDataTimezoneInfo.
• Methods that return local times (such as Timezone#utc_to_local) now return results using the appropriate local UTC offset instead of always using UTC.

This pull request includes changes that make et-orbi compatible with both the upcoming tzinfo v2.0.0 release and existing tzinfo releases.

To test with the current development version of tzinfo instead of a released version, you can add the following line to the Gemfile:

gem 'tzinfo', git: 'https://github.com/tzinfo/tzinfo.git'

[jmettraux]

Hello @philr, yes, I know who you are. I follow you. Thanks for all your work. It's everywhere Ruby is.

Thanks for this, it spares me many many headaches.

Have a nice day!