fix: dont use object.assign/spread

so we dont need a polyfill

src/browser.js

@@ -1,6 +1,6 @@
 import { version } from '../package.json'
 import createMixin from './shared/mixin'
-import setOptions from './shared/options'
+import { setOptions } from './shared/options'
 import { isUndefined } from './utils/is-type'
 import $meta from './client/$meta'
 import { hasMetaInfo } from './shared/meta-helpers'