Support Ruby 3.0 / webrick 1.7.0

[pvalena]

Currently the tests fail for me with webrick-related error:

+ rspec spec
#<Thread:0x000055a87248e4f8 /builddir/build/BUILD/ethon-0.12.0/usr/share/gems/gems/ethon-0.12.0/spec/support/localhost_server.rb:75 run> terminated with exceptio>
/usr/share/gems/gems/rack-2.2.3/lib/rack/handler/webrick.rb:26:in `run': wrong number of arguments (given 2, expected 1) (ArgumentError)
        from /builddir/build/BUILD/ethon-0.12.0/usr/share/gems/gems/ethon-0.12.0/spec/support/localhost_server.rb:46:in `boot'
        from /builddir/build/BUILD/ethon-0.12.0/usr/share/gems/gems/ethon-0.12.0/spec/support/localhost_server.rb:29:in `block in initialize'
        from /builddir/build/BUILD/ethon-0.12.0/usr/share/gems/gems/ethon-0.12.0/spec/support/localhost_server.rb:75:in `block in concurrently'

An error occurred in a `before(:suite)` hook.
Failure/Error: raise TimeoutError.new(error_message) if (Time.now - start_time) > timeout

Timeout::Error:
  Boot failed.
# ./spec/support/localhost_server.rb:89:in `wait_until'
# ./spec/support/localhost_server.rb:30:in `initialize'
# ./spec/spec_helper.rb:25:in `new'
# ./spec/spec_helper.rb:25:in `block (2 levels) in <top (required)>'

Finished in 10.05 seconds (files took 0.44725 seconds to load)
0 examples, 0 failures, 1 error occurred outside of examples

When run from Fedora build system. Note that we do not use Bundler to handle dependencies, as we use system ones.

[pvalena]

Note that typhoeus test suite suffers the same failure.

[jas0nmjames]

I'm not sure if this is related, but I'm having a problem when trying to build jekyll with ethon.

[BUG] Bus Error at 0x00007f9a6b052d30
ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [x86_64-darwin20]

Please see attached log.
log.log

[voxik]

I'm not sure if this is related, but I'm having a problem when trying to build jekyll with ethon.

This seems to be unrelated.

[jas0nmjames]

I'm not sure if this is related, but I'm having a problem when trying to build jekyll with ethon.

This seems to be unrelated.

Thank you @voxik