feat(bundler-webpack): enable options API by default

Author: meteorlxy

packages/@vuepress/bundler-webpack/src/config/handlePluginDefine.ts

@@ -21,9 +21,9 @@ export const handlePluginDefine = ({
       '__VERSION__': JSON.stringify(app.version),
       '__DEV__': JSON.stringify(app.env.isDev),
       '__SSR__': JSON.stringify(isServer),
-      // disable options API by default
       // @see http://link.vuejs.org/feature-flags
-      '__VUE_OPTIONS_API__': JSON.stringify(false),
+      // enable options API by default
+      '__VUE_OPTIONS_API__': JSON.stringify(true),
       '__VUE_PROD_DEVTOOLS__': JSON.stringify(false),
     },
   ])