Replace methodTypString func with reverseMethodMap (#1018)

This code predates the introduction of the reverseMethodMap.

Author: JRaspass

tree.go

@@ -650,11 +650,9 @@ func (n *node) routes() []Route {
 				if h.handler == nil {
 					continue
 				}
-				m := methodTypString(mt)
-				if m == "" {
-					continue
+				if m, ok := reverseMethodMap[mt]; ok {
+					hs[m] = h.handler
 				}
-				hs[m] = h.handler
 			}
 
 			rt := Route{subroutes, hs, p}
@@ -788,15 +786,6 @@ func longestPrefix(k1, k2 string) int {
 	return i
 }
 
-func methodTypString(method methodTyp) string {
-	for s, t := range methodMap {
-		if method == t {
-			return s
-		}
-	}
-	return ""
-}
-
 type nodes []*node
 
 // Sort the list of nodes by label