Fix Requirement equality

Library/Homebrew/requirement.rb

@@ -75,9 +75,10 @@ class Requirement
     self.class.env_proc
   end
 
-  def eql?(other)
+  def ==(other)
     instance_of?(other.class) && name == other.name && tags == other.tags
   end
+  alias_method :eql?, :==
 
   def hash
     name.hash ^ tags.hash

Library/Homebrew/test/test_requirement.rb

@@ -129,12 +129,14 @@ class RequirementTests < Homebrew::TestCase
 
   def test_eql
     a, b = Requirement.new, Requirement.new
+    assert_equal a, b
     assert_eql a, b
     assert_equal a.hash, b.hash
   end
 
   def test_not_eql
     a, b = Requirement.new([:optional]), Requirement.new
+    refute_equal a, b
     refute_eql a, b
     refute_equal a.hash, b.hash
   end