Remove signal alias.

Author: samuel-williams-shopify

lib/async/promise.rb

@@ -183,8 +183,5 @@ def fulfill(&block)
 				self.resolve(nil) unless @resolved
 			end
 		end
-		
-		# Alias for resolve to match common promise APIs.
-		alias signal resolve
 	end
 end

test/async/promise.rb

@@ -189,15 +189,6 @@
 		end
 	end
 
-	with "signal alias" do
-		it "signal behaves like resolve" do
-			promise.signal(:aliased_value)
-			
-			expect(promise.resolved?).to be == true
-			expect(promise.wait).to be == :aliased_value
-		end
-	end
-	
 	with "warning suppression" do
 		it "can suppress warnings for expected failures" do
 			promise.suppress_warnings!