awesome_print

• Tests work with Ruby 2.6.6, 2.7.2 and 3.0.0$
• Update awsome_print.gemspec nokogiri dependency to resolve CVEs [@gvwirth]

No functional changes, just some behind-the-scenes updates:

• Updated code so it can be released to rubygems.
• Updated nokogiri to resolve vulnerability scan

There are a number of changes, so please report any bugs you find!

Changes

• Expanded tests to run against Ruby 2.7.x, Rails 6.0-6.1 and Mongoid 7.0-7.1 [@BryanH]
• Update method signature after change in IRB [@febeling]
• Fixes block and proc definition to work with Ruby 3.0.0 [@csalvato] - [#392]
• Removed check for Ruby 2.4 a...