Allow custom release URL.

lib/constants.js

@@ -7,7 +7,8 @@ export const DASHBOARD_CONFIG = 'umami.dashboard';
 export const VERSION_CHECK = 'umami.version-check';
 export const SHARE_TOKEN_HEADER = 'x-umami-share-token';
 export const HOMEPAGE_URL = 'https://umami.is';
-export const VERSION_URL = 'https://github.com/mikecao/umami/releases';
+export const REPO_URL = 'https://github.com/umami-software/umami';
+export const UPDATES_URL = 'https://api.umami.is/v1/updates';
 
 export const DEFAULT_LOCALE = 'en-US';
 export const DEFAULT_THEME = 'light';