Delete never-completed map-tree package

src/packages/map-tree/index.js

@@ -1,18 +0,0 @@
-"use strict";
-
-// FIXME: Finish this later
-
-const { validateArguments } = require("@validatem/core");
-const isString = require("@validatem/is-string");
-const isFunction = require("@validatem/is-function");
-const required = require("@validatem/required");
-
-module.exports = function mapTree(tree, predicate, childrenProperty) {
-	validateArguments(arguments, {
-		tree: [ required ],
-		predicate: [ required, isFunction ],
-		childrenProperty: [ isString ]
-	});
-
-	
-};