Use for ... range inside New

New walks over the range of segment values but does not alter or append
to segments, so we can use for range to reduce the length of the
function by 1 line.

router.go

@@ -273,8 +273,7 @@ func New(path string, handler interface{}) Router {
 
 	// prepare and validate pattern segments to match
 	segments := strings.Split(strings.Trim(p, "/"), "/")
-	for i := 0; i < len(segments); i++ {
-		seg := segments[i]
+	for i, seg := range segments {
 		segments[i] = "/" + seg
 		if pos := strings.IndexAny(seg, ":*"); pos == -1 {
 			continue