Commits on Jan 5, 2021

1. Add new Lint/DeprecatedConstants cop …

   This PR adds new `Lint/DeprecatedConstants` cop.
   
   This cop checks for deprecated constants.
   
   It has `DeprecatedConstants` config. If there is an alternative method,
   you can set alternative value as `Alternative`.
   And you can set the deprecated version as `DeprecatedVersion`.
   These options can be omitted if they are not needed.
   By default, `NIL`, `TRUE`, `FALSE` and `Random::DEFAULT` are configured.
   
   ```ruby
   # bad
   NIL
   TRUE
   FALSE
   Random::DEFAULT # Return value of Ruby 2 is `Random` instance, Ruby 3.0 is `Random` class.
   
   # good
   nil
   true
   false
   Random.new # `::DEFAULT` has been deprecated in Ruby 3, `.new` is compatible with Ruby 2.
   ```
   
   The following are these sources of information.
   
   - Remove (deprecated) `NIL`, `TRUE`, and `FALSE` ... ruby/ruby@62554ca
   - Deprecate `Random::DEFAULT` ... https://bugs.ruby-lang.org/issues/17351

   

   koic committed Jan 5, 2021
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