update to webpack4.0 (#136)

* dev

* update

* fix

* refine

* add ScriptExtHtmlWebpackPlugin

* update

* format

* refine

* typo

* format

* docs

* docs

build/check-versions.js

@@ -4,8 +4,11 @@ const semver = require('semver')
 const packageConfig = require('../package.json')
 const shell = require('shelljs')
 
-function exec (cmd) {
-  return require('child_process').execSync(cmd).toString().trim()
+function exec(cmd) {
+  return require('child_process')
+    .execSync(cmd)
+    .toString()
+    .trim()
 }
 
 const versionRequirements = [
@@ -24,23 +27,30 @@ if (shell.which('npm')) {
   })
 }
 
-module.exports = function () {
+module.exports = function() {
   const warnings = []
 
   for (let i = 0; i < versionRequirements.length; i++) {
     const mod = versionRequirements[i]
 
     if (!semver.satisfies(mod.currentVersion, mod.versionRequirement)) {
-      warnings.push(mod.name + ': ' +
-        chalk.red(mod.currentVersion) + ' should be ' +
-        chalk.green(mod.versionRequirement)
+      warnings.push(
+        mod.name +
+          ': ' +
+          chalk.red(mod.currentVersion) +
+          ' should be ' +
+          chalk.green(mod.versionRequirement)
       )
     }
   }
 
   if (warnings.length) {
     console.log('')
-    console.log(chalk.yellow('To use this template, you must update following to modules:'))
+    console.log(
+      chalk.yellow(
+        'To use this template, you must update following to modules:'
+      )
+    )
     console.log()
 
     for (let i = 0; i < warnings.length; i++) {