Fix formatting and add unpkg

Author: LukasDrgon

src/v2/guide/installation.md

@@ -35,9 +35,9 @@ Simply download and include with a script tag. `Vue` will be registered as a glo
 
 ### CDN
 
-Recommended:[https://cdn.jsdelivr.net/npm/vue](https://cdn.jsdelivr.net/npm/vue), which will reflect the latest version as soon as it is published to npm. You can also browse the source of the npm package at [https://www.jsdelivr.com/package/npm/vue/](https://www.jsdelivr.com/package/npm/vue/).
+Recommended: [https://cdn.jsdelivr.net/npm/vue](https://cdn.jsdelivr.net/npm/vue), which will reflect the latest version as soon as it is published to npm. You can also browse the source of the npm package at [https://www.jsdelivr.com/package/npm/vue/](https://www.jsdelivr.com/package/npm/vue/).
 
-Also available on [cdnjs](https://cdnjs.cloudflare.com/ajax/libs/vue/{{vue_version}}/vue.js), but this service takes some time to sync so the latest release may not be available yet.
+Also available on [unpkg](https://unpkg.com/vue) and [cdnjs](https://cdnjs.cloudflare.com/ajax/libs/vue/{{vue_version}}/vue.js) (cdnjs takes some time to sync so the latest release may not be available yet).
 
 ## NPM