refactored New

chain.go

diff --git a/chain.go b/chain.go
index d281ad3..8adf0c0 100644
--- a/chain.go
+++ b/chain.go
@@ -21,10 +21,7 @@
 // New serves no other function,
 // constructors are only called upon a call to Then().
 func New(constructors ...Constructor) Chain {
-	c := Chain{}
-	c.constructors = append(c.constructors, constructors...)
-
-	return c
+	return Chain{append(([]Constructor)(nil), constructors...)}
 }
 
 // Then chains the middleware and returns the final http.Handler.