Update dependencies

Author: danivek

.eslintrc

@@ -6,7 +6,7 @@
     "plugin:jsdoc/recommended",
   ],
   "parserOptions": {
-    "ecmaVersion": 6
+    "ecmaVersion": 2018
   },
   "env": {
     "node": true,

.gitignore

@@ -1,3 +1,4 @@
 node_modules/
 coverage/
+.nyc_output/
 .idea/

lib/JSONAPISerializer.js

@@ -57,7 +57,7 @@ module.exports = class JSONAPISerializer {
     }
 
     schema = schema || 'default';
-    options = Object.assign({}, this.opts, options);
+    options = { ...this.opts, ...options };
 
     this.schemas[type] = this.schemas[type] || {};
     this.schemas[type][schema] = validateOptions(options);

lib/lru-cache.js

@@ -1,3 +1,5 @@
+/* eslint-disable */
+
 // Influenced by http://jsfiddle.net/2baax9nk/5/
 
 class Node {

lib/validator.js

@@ -7,22 +7,20 @@
  * @returns {object} valid configuration options.
  */
 function validateOptions(options) {
-  options = Object.assign(
-    {
-      id: 'id',
-      blacklist: [],
-      whitelist: [],
-      links: {},
-      relationships: {},
-      topLevelLinks: {},
-      topLevelMeta: {},
-      meta: {},
-      blacklistOnDeserialize: [],
-      whitelistOnDeserialize: [],
-      jsonapiObject: true
-    },
-    options
-  );
+  options = {
+    id: 'id',
+    blacklist: [],
+    whitelist: [],
+    links: {},
+    relationships: {},
+    topLevelLinks: {},
+    topLevelMeta: {},
+    meta: {},
+    blacklistOnDeserialize: [],
+    whitelistOnDeserialize: [],
+    jsonapiObject: true,
+    ...options
+  };
 
   if (!Array.isArray(options.blacklist)) throw new Error("option 'blacklist' must be an array");
   if (!Array.isArray(options.whitelist)) throw new Error("option 'whitelist' must be an array");
@@ -64,10 +62,12 @@ function validateOptions(options) {
 
   const { relationships } = options;
   Object.keys(relationships).forEach(key => {
-    relationships[key] = Object.assign(
-      { schema: 'default', links: {}, meta: {} },
-      relationships[key]
-    );
+    relationships[key] = {
+      schema: 'default',
+      links: {},
+      meta: {},
+      ...relationships[key]
+    };
 
     if (!relationships[key].type)
       throw new Error(`option 'type' for relationship '${key}' is required`);
@@ -110,7 +110,7 @@ function validateOptions(options) {
  * @returns {object} valid dynamic type options.
  */
 function validateDynamicTypeOptions(options) {
-  options = Object.assign({ topLevelLinks: {}, topLevelMeta: {}, jsonapiObject: true }, options);
+  options = { topLevelLinks: {}, topLevelMeta: {}, jsonapiObject: true, ...options };
 
   if (!options.type) throw new Error("option 'type' is required");
   if (typeof options.type !== 'string' && typeof options.type !== 'function') {