chore: upgrade deps to fix npm audit complaints

.npmrc

@@ -0,0 +1 @@
+package-lock=true

.travis.yml

@@ -1,7 +1,6 @@
 sudo: false
 language: node_js
 node_js:
-  - "4"
   - "6"
   - "8"
 

package.json

@@ -20,29 +20,29 @@
     "lint": "eslint ."
   },
   "engines": {
-    "node": ">=4"
+    "node": ">=6"
   },
   "license": "MIT",
   "dependencies": {
-    "async": "~0.9.0",
-    "commondir": "0.0.1",
-    "debug": "^2.0.0",
-    "lodash": "^4.17.5",
-    "semver": "^4.1.0",
-    "strong-globalize": "^2.6.2",
-    "toposort": "^0.2.10"
+    "async": "^2.6.2",
+    "commondir": "^1.0.1",
+    "debug": "^3.2.6",
+    "lodash": "^4.17.11",
+    "semver": "^5.6.0",
+    "strong-globalize": "^4.1.3",
+    "toposort": "^2.0.2"
   },
   "devDependencies": {
-    "browserify": "^4.1.8",
     "bluebird": "^3.1.1",
+    "browserify": "^16.2.3",
     "chai": "^1.10.0",
     "coffee-script": "^1.8.0",
     "coffeeify": "^0.7.0",
     "eslint": "^2.5.3",
     "eslint-config-loopback": "^1.0.0",
-    "fs-extra": "^0.12.0",
+    "fs-extra": "^7.0.1",
     "loopback": "^2.16.3",
-    "mocha": "^1.19.0",
-    "supertest": "^0.14.0"
+    "mocha": "^6.0.2",
+    "supertest": "^4.0.2"
   }
 }

test/executor.test.js

@@ -237,7 +237,7 @@ describe('executor', function() {
   it('skips definition of already defined LoopBack models', function() {
     var builtinModel = {
       name: 'User',
-      definition: fs.readJsonFileSync(
+      definition: fs.readJson(
         require.resolve('loopback/common/models/user.json')
       ),
       config: { dataSource: 'db' },

test/helpers/browser.js

@@ -8,7 +8,8 @@ var vm = require('vm');
 function createContext() {
   var context = {
     // required by browserify
-    XMLHttpRequest: function() { throw new Error('not implemented'); },
+    XMLHttpRequest: function() {},
+    clearTimeout: function() {},
     FormData: function() { throw new Error('not implemented'); },
 
     localStorage: {