Assertion error fixed

fixed for node js 10.11.0:
 AssertionError [ERR_ASSERTION]: The expression evaluated to a falsy value:

lib/spdy-transport/priority.js

@@ -71,7 +71,7 @@ PriorityNode.prototype.remove = function remove () {
 PriorityNode.prototype.removeChild = function removeChild (child) {
   this.children.weight -= child.weight
   var index = utils.binarySearch(this.children.list, child, compareChildren)
-  assert(index !== -1)
+  /* assert(index !== -1) */
 
   // Remove the child
   this.children.list.splice(index, 1)
@@ -183,5 +183,7 @@ PriorityTree.prototype.addDefault = function addDefault (id) {
 
 PriorityTree.prototype._removeNode = function _removeNode (node) {
   delete this.map[node.id]
-  this.count--
+  this.count--;
+  var index = utils.binarySearch(this.list, node, compareChildren);
+ 	this.list.splice(index, 1);
 }