fix mocha name

Author: yyx990803

packages/@vue/cli-plugin-unit-mocha/README.md

@@ -1,3 +1,3 @@
-# @vue/cli-plugin-unit-mocha-webpack
+# @vue/cli-plugin-unit-mocha
 
-> unit-mocha-webpack plugin for vue-cli
+> unit-mocha plugin for vue-cli

packages/@vue/cli-plugin-unit-mocha/__tests__/mochaGenerator.spec.js

@@ -3,7 +3,7 @@ const generateWithPlugin = require('@vue/cli-test-utils/generateWithPlugin')
 test('base', async () => {
   const { pkg, files } = await generateWithPlugin([
     {
-      id: 'unit-mocha-webpack',
+      id: 'unit-mocha',
       apply: require('../generator'),
       options: {}
     },

packages/@vue/cli-plugin-unit-mocha/__tests__/mochaPlugin.spec.js

@@ -3,12 +3,10 @@ jest.setTimeout(20000)
 const create = require('@vue/cli-test-utils/createTestProject')
 
 test('should work', async () => {
-  const project = await create('unit-mocha-webpack', {
+  const project = await create('unit-mocha', {
     plugins: {
       '@vue/cli-plugin-babel': {},
-      '@vue/cli-plugin-unit-mocha-webpack': {
-        assertionLibrary: 'chai'
-      }
+      '@vue/cli-plugin-unit-mocha': {}
     }
   })
   await project.run(`vue-cli-service test`)