Fix issue with util._extend deprecation in @ladjs/consolidate

lib/consolidate.js

@@ -180,7 +180,7 @@ function fromStringRenderer(name) {
 
     return promisify(cb, function (cb) {
       readPartials(path, options, function (err, partials) {
-        const extend = requires.extend || (requires.extend = util._extend);
+        const extend = requires.extend || (requires.extend = Object.assign);
         const opts = extend({}, options);
         opts.partials = partials;
         if (err) return cb(err);
@@ -1363,7 +1363,7 @@ exports.dot.render = function (str, options, cb) {
   return promisify(cb, function (cb) {
     try {
       const engine = requires.dot || (requires.dot = require('dot'));
-      const extend = requires.extend || (requires.extend = util._extend);
+      const extend = requires.extend || (requires.extend = Object.assign);
       let settings = {};
       settings = extend(settings, engine.templateSettings);
       settings = extend(settings, options ? options.dot : {});
@@ -1421,7 +1421,7 @@ exports.ractive.render = function (str, options, cb) {
       options.template = template;
 
       if (options.data === null || options.data === undefined) {
-        const extend = requires.extend || (requires.extend = util._extend);
+        const extend = requires.extend || (requires.extend = Object.assign);
 
         // Shallow clone the options object
         options.data = extend({}, options);