Node#wait should return nil.

Author: ioquatix

lib/async/node.rb

@@ -300,7 +300,7 @@ def stop(later = false)
 		#
 		# @returns [self] Returns self for method chaining.
 		def wait
-			self
+			nil
 		end
 
 		# Whether the node has been stopped.

test/async/node.rb

@@ -315,7 +315,7 @@
 	with "#wait" do
 		it "returns self for a plain node" do
 			result = node.wait
-			expect(result).to be_equal(node)
+			expect(result).to be_nil
 		end
 	end
 end