Ruby 3 incompatibility (usage of `RubyToken`)

[hakanai]

Running Saikuro currently fails on ruby 3 as it makes use of RubyToken. e.g.:

Saikuro/lib/saikuro/token_counter.rb

Lines 2 to 3 in 25a3f41

	class TokenCounter
	include RubyToken

The NameError suggests RubyLex but I have no idea whether that's a good lead.

In my investigation, I was able to figure out that this module was removed in Ruby 2.7, but I haven't been able to find any documentation describing why it was removed or what the replacement is.

[skull-squadron]

Encountered this also. Gotta love arbitrary semver-breaking changes, but this seems to be a consequence of rule-by-fiat-of-a-few-devs under-governance @ MRI.

[bf4]

ok, that's a little aggressive