build: fix corejs version error of babel in test env

PeachScript · PeachScript · commit ccf1a2084d5b · 2019-04-01T00:23:00.000+08:00
diff --git a/scripts/webpack.config.js b/scripts/webpack.config.js
@@ -40,7 +40,7 @@ module.exports = {
           plugins: ['@babel/plugin-transform-runtime'],
           env: {
             test: {
-              presets: [['@babel/preset-env', { useBuiltIns: 'usage' }]],
+              presets: [['@babel/preset-env', { useBuiltIns: 'usage', corejs: '3.0.0' }]],
               plugins: ['babel-plugin-istanbul']
             }
           }

Original file line number	Diff line number	Diff line change
`@@ -40,7 +40,7 @@ module.exports = {`
`40`	`40`	`plugins: ['@babel/plugin-transform-runtime'],`
`41`	`41`	`env: {`
`42`	`42`	`test: {`
`43`		`- presets: [['@babel/preset-env', { useBuiltIns: 'usage' }]],`
	`43`	`+ presets: [['@babel/preset-env', { useBuiltIns: 'usage', corejs: '3.0.0' }]],`
`44`	`44`	`plugins: ['babel-plugin-istanbul']`
`45`	`45`	`}`
`46`	`46`	`}`