Dependency: use instanceof? in eql?

This matches the eql? definition for requirements.

1 files changed, 1 insertions, 1 deletions

diff --git a/Library/Homebrew/dependency.rb b/Library/Homebrew/dependency.rb
index d87d74ccf..cc378b7df 100644
--- a/Library/Homebrew/dependency.rb
+++ b/Library/Homebrew/dependency.rb
@@ -20,7 +20,7 @@ class Dependency
   end
 
   def eql?(other)
-    other.is_a?(self.class) && hash == other.hash
+    instance_of?(other.class) && hash == other.hash
   end
 
   def hash