brew-versions: move to Contributions.

Eventually we'll move Contributions to a tap too.

Closes Homebrew/homebrew#30298.

Library/Contributions/cmd/brew-versions.rb

@@ -0,0 +1,19 @@
+require "formula_versions"
+
+raise "Please `brew install git` first" unless which "git"
+raise "Please `brew update` first" unless (HOMEBREW_REPOSITORY/".git").directory?
+raise FormulaUnspecifiedError if ARGV.named.empty?
+
+opoo <<-EOS.undent
+  brew-versions is unsupported and may be removed soon.
+  Please use the homebrew-versions tap instead:
+    https://github.com/Homebrew/homebrew-versions
+EOS
+ARGV.formulae.each do |f|
+  versions = FormulaVersions.new(f)
+  path = versions.repository_path
+  versions.each do |version, rev|
+    print "#{Tty.white}#{version.to_s.ljust(8)}#{Tty.reset} "
+    puts "git checkout #{rev} #{path}"
+  end
+end

Library/Homebrew/cmd/versions.rb

@@ -1,23 +0,0 @@
-require "formula_versions"
-
-module Homebrew
-  def versions
-    raise "Please `brew install git` first" unless which "git"
-    raise "Please `brew update` first" unless (HOMEBREW_REPOSITORY/".git").directory?
-    raise FormulaUnspecifiedError if ARGV.named.empty?
-
-    opoo <<-EOS.undent
-      brew-versions is unsupported and may be removed soon.
-      Please use the homebrew-versions tap instead:
-        https://github.com/Homebrew/homebrew-versions
-    EOS
-    ARGV.formulae.each do |f|
-      versions = FormulaVersions.new(f)
-      path = versions.repository_path
-      versions.each do |version, rev|
-        print "#{Tty.white}#{version.to_s.ljust(8)}#{Tty.reset} "
-        puts "git checkout #{rev} #{path}"
-      end
-    end
-  end
-end