Add version to cargo add on version detail page

Author: stephank

app/components/crate-sidebar.js

@@ -15,7 +15,9 @@ export default class CrateSidebar extends Component {
   }
 
   get cargoAddCommand() {
-    return `cargo add ${this.args.crate.name}`;
+    return this.args.requestedVersion
+      ? `cargo add ${this.args.crate.name}@${this.args.requestedVersion}`
+      : `cargo add ${this.args.crate.name}`;
   }
 
   get tomlSnippet() {

app/templates/crate/version.hbs

@@ -47,6 +47,7 @@
     <CrateSidebar
       @crate={{this.crate}}
       @version={{this.currentVersion}}
+      @requestedVersion={{this.requestedVersion}}
       local-class="sidebar"
     />
   </div>