drop unused packages and stage-2

.babelrc

@@ -1,7 +1,6 @@
 {
     "presets": [
-        ["env", { "targets": {"node": "current"} }],
-        "stage-2"
+        ["@babel/env", { "targets": {"node": "current"} }]
     ],
-    "plugins": ["transform-async-to-generator"]
+    "plugins": ["@babel/plugin-transform-async-to-generator"]
 }

gulpfile.js

@@ -1,6 +1,5 @@
 const gulp = require('gulp')
 const babel = require('gulp-babel')
-const concat = require('gulp-concat-util')
 const clean = require('gulp-clean')
 const print = require('gulp-print').default
 const nodemon = require('gulp-nodemon')
@@ -23,7 +22,6 @@ gulp.task('build', () =>
   gulp.src('src/**/*.js')
     .pipe(babel())
     .pipe(print())
-    .pipe(concat.scripts('counter.js'))
     .pipe(gulp.dest('dist/'))
 )
 

package.json

@@ -13,15 +13,11 @@
   "devDependencies": {
     "@babel/cli": "^7.1.2",
     "@babel/core": "^7.1.2",
+    "@babel/plugin-transform-async-to-generator": "^7.1.0",
     "@babel/preset-env": "^7.1.0",
-    "@babel/preset-stage-2": "^7.0.0",
     "gulp": "^3.9.1",
-    "gulp-babel": "^7.0.1",
+    "gulp-babel": "^8.0.0-beta.2",
     "gulp-clean": "^0.4.0",
-    "gulp-concat": "^2.6.1",
-    "gulp-concat-util": "^0.5.5",
-    "gulp-count": "^1.0.0",
-    "gulp-debug": "^4.0.0",
     "gulp-nodemon": "^2.2.1",
     "gulp-print": "^5.0.0",
     "nodemon": "^1.18.4"