Fix link

Author: norkunas

README.md

@@ -10,7 +10,7 @@
 
 ## Install
 
-Note: All examples are for v2, if you are using PHP <7.3 please read [v1 documentation](/blob/1.0/README.md).
+Note: All examples are for v2, if you are using PHP <7.3 please read [v1 documentation](https://github.com/norkunas/onesignal-php-api/blob/1.0/README.md).
 
 This packages requires a PSR-18 HTTP client and PSR-17 HTTP factories to work. You can choose any from
 [psr/http-client-implementation](https://packagist.org/providers/psr/http-client-implementation)