fix: support yeoman generator app/index.js folder

lib/internal/generator/generator.js

@@ -38,20 +38,24 @@ class Generator {
           name && self.run(name, ctx);
         });
       } else {
-        log.warn('检测到你还未安装任何模板，请先安装后再进行项目初始化，参考文档：https://github.com/iv-web/feflow-cli/blob/master/README.md')
+        log.warn(
+          '检测到你还未安装任何模板，请先安装后再进行项目初始化，' +
+          '参考文档：https://github.com/iv-web/feflow-cli/blob/master/README.md'
+        );
       }
     });
   }
 
   run(name) {
     const ctx = this.ctx;
-
     const pluginDir = ctx.pluginDir;
+    let path = pathFn.join(pluginDir, name, 'app/index.js');
 
-    const path = pathFn.join(pluginDir, name, 'generators/app/index.js');
+    if (!fs.existsSync(path)) {
+      path = pathFn.join(pluginDir, name, 'generators', 'app/index.js');
+    }
 
     yeomanEnv.register(require.resolve(path), name);
-
     yeomanEnv.run(name, { 'skip-install': true }, err => {});
   }
 
@@ -88,10 +92,7 @@ class Generator {
         const json = JSON.parse(content);
         const desc = json.description;
 
-        return {
-          name,
-          desc
-        };
+        return { name, desc };
       });
     });
   }