fix: windows entryName path error, use path.posix

Author: hubcarl

package.json

@@ -1,6 +1,6 @@
 {
   "name": "easywebpack",
-  "version": "4.8.0",
+  "version": "4.8.2",
   "description": "基于 Webpack 的前端构建工程化解决方案",
   "keywords": [
     "webpack",

utils/utils.js

@@ -147,7 +147,7 @@ utils.getGlobEntry = (config, type) => {
     const entries = {};
     files.forEach(file => {
       const ext = path.extname(file);
-      const entryName = path.relative(root, file).replace(ext, '');
+      const entryName = path.posix.relative(root, file).replace(ext, '');
       entries[entryName] = utils.normalizePath(file, baseDir);
     });
     return entries;