fix the import for v7 of semver

Author: locks

app/routes/crate/version.js

@@ -1,7 +1,7 @@
 import { observer } from '@ember/object';
 import Route from '@ember/routing/route';
 import { inject as service } from '@ember/service';
-import { prerelease } from 'semver';
+import prerelease from 'semver/functions/prerelease';
 
 import fetch from 'fetch';
 import ajax from 'ember-fetch/ajax';