Upgrade node dependencies

gulpfile.js

@@ -1,6 +1,6 @@
 const { src, dest, series, parallel, watch } = require('gulp'),
     gulpSass = require('gulp-sass'),
-    asciidoctor = require('gulp-asciidoctor'),
+    asciidoctor = require('@asciidoctor/gulp-asciidoctor'),
     gulpConnect = require('gulp-connect');
 
 const paths = {

package.json

@@ -6,11 +6,11 @@
   "license": "Apache-2.0",
   "dependencies": {},
   "devDependencies": {
+    "@asciidoctor/gulp-asciidoctor": "^2.2.5",
     "gulp": "^4.0.2",
-    "gulp-asciidoctor": "^1.5.5-4.3",
-    "gulp-connect": "^5.6.1",
-    "gulp-sass": "^4.0.2",
-    "node-sass": "^4.13.1"
+    "gulp-connect": "^5.7.0",
+    "gulp-sass": "^4.1.0",
+    "node-sass": "^4.14.1"
   },
   "scripts": {
     "build": "gulp",