Add explicit version to download links (vuejs#1398)

* Add explicit version to download links

* improve CDN section of installation page

pre-deploy.js

@@ -39,6 +39,7 @@ Promise.all([
     installation
       .replace(/vue_version: .*/, 'vue_version: ' + version)
       .replace(/gz_size:.*/g, `gz_size: "${prodSize}"`)
+      .replace(/\/vue@[\d\.]+\//g, `/vue@${version}/`)
   )
   console.log(`\nSuccessfully updated Vue version and gzip file size.\n`)
 }).catch(err => {

src/v2/guide/installation.md

@@ -34,9 +34,18 @@ 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://cdn.jsdelivr.net/npm/vue/](https://cdn.jsdelivr.net/npm/vue/).
+We recommend linking to a specific version number that you can update manually:
 
-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).
+``` html
+<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/vue.js"></script>
+```
+
+You can browse the source of the NPM package at [cdn.jsdelivr.net/npm/vue](https://cdn.jsdelivr.net/npm/vue/).
+
+Vue is also available on [unpkg](https://unpkg.com/vue@{{vue_version}}/dist/vue.js) 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).
+
+Make sure to read about [the different builds of Vue](#Explanation-of-Different-Builds) and use the **production
+ version** in your published site, replacing `vue.js` with `vue.min.js`. This is a smaller build optimized for speed instead of development experience.
 
 ## NPM