fix: no need to assertCliVersion. avoid breaking old versions

Author: haoqunjiang

packages/@vue/cli-plugin-eslint/generator/index.js

@@ -2,9 +2,6 @@ const fs = require('fs')
 const path = require('path')
 
 module.exports = (api, { config, lintOn = [] }, _, invoking) => {
-  api.assertCliVersion('^4.0.0-alpha.4')
-  api.assertCliServiceVersion('^4.0.0-alpha.4')
-
   if (typeof lintOn === 'string') {
     lintOn = lintOn.split(',')
   }

packages/@vue/cli-plugin-router/generator/index.js

@@ -1,7 +1,4 @@
 module.exports = (api, options = {}) => {
-  api.assertCliVersion('^4.0.0-alpha.3')
-  api.assertCliServiceVersion('^4.0.0-alpha.3')
-
   api.injectImports(api.entryFile, `import router from './router'`)
   api.injectRootOptions(api.entryFile, `router`)
 

packages/@vue/cli-plugin-vuex/generator/index.js

@@ -1,7 +1,4 @@
 module.exports = (api, options = {}) => {
-  api.assertCliVersion('^4.0.0-alpha.3')
-  api.assertCliServiceVersion('^4.0.0-alpha.3')
-
   api.injectImports(api.entryFile, `import store from './store'`)
   api.injectRootOptions(api.entryFile, `store`)