Support for Ruby 2.7 #21514
Description
Is your feature request related to a problem? Please describe.
grpc gem fails to install under Ruby 2.7:
$ RBENV_VERSION=2.7.0-preview3 gem install grpc
Fetching grpc-1.25.0-universal-darwin.gem
Fetching google-protobuf-3.11.2-universal-darwin.gem
Fetching googleapis-common-protos-types-1.0.4.gem
Successfully installed google-protobuf-3.11.2-universal-darwin
Successfully installed googleapis-common-protos-types-1.0.4
ERROR: Error installing grpc:
The last version of grpc (>= 0) to support your Ruby & RubyGems was 1.25.0. Try installing it with `gem install grpc -v 1.25.0`
grpc requires Ruby version >= 2.3, < 2.7.dev. The current ruby version is 2.7.0.preview3.
Describe the solution you'd like
grpc gem should successfully install with Ruby 2.7.
Describe alternatives you've considered
Sticking to Ruby < 2.7.
Additional context
With the release of Ruby 2.7 expected to come later this month, support for it will soon become a need for the Ruby community.