tree: Add comment on #65 fix

tree.go

diff --git a/tree.go b/tree.go
index 47af948..b9d51e4 100644
--- a/tree.go
+++ b/tree.go
@@ -118,6 +118,7 @@
 				}
 
 				n.children = []*node{&child}
+				// []byte for proper unicode char conversion, see #65
 				n.indices = string([]byte{n.path[i]})
 				n.path = path[:i]
 				n.handle = nil
@@ -169,6 +170,7 @@
 
 				// Otherwise insert it
 				if c != ':' && c != '*' {
+					// []byte for proper unicode char conversion, see #65
 					n.indices += string([]byte{c})
 					child := &node{
 						maxParams: numParams,