Remove lint files from gem

(I lumped all lib/* files together - the list was longer)

Before
------

[".codeclimate.yml",
 ".github/workflows/ci.yaml",
 ".gitignore",
 ".rspec",
 ".rubocop.yml",
 ".rubocop_cc.yml",
 ".rubocop_local.yml",
 ".whitesource",
 ".yamllint",
 "CHANGELOG.md",
 "Gemfile",
 "LICENSE.txt",
 "README.md",
 "Rakefile",
 "activerecord-virtual_attributes.gemspec",
 "bin/console",
 "bin/setup",
 "init.rb",
 "lib/*",
 "renovate.json"]

After
-----

["CHANGELOG.md",
 "Gemfile",
 "LICENSE.txt",
 "README.md",
 "Rakefile",
 "activerecord-virtual_attributes.gemspec",
 "init.rb",
 "lib/*"]

activerecord-virtual_attributes.gemspec

@@ -23,7 +23,7 @@ Gem::Specification.new do |spec|
   # Specify which files should be added to the gem when it is released.
   # The `git ls-files -z` loads the files in the RubyGem that have been added into git.
   spec.files = Dir.chdir(File.expand_path('..', __FILE__)) do
-    `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
+    `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features|bin)/}) || f.match(/^(\.)|renovate.json/) }
   end
 
   spec.require_paths = ["lib"]