docs: update v7 readme file url

Author: Nolanus

README.md

@@ -47,8 +47,8 @@ Install later versions in case your app is not running the very latest angular v
 
 | ngx-page-scroll/ngx-page-scroll-core version | compatible angular version | Documentation                                                              |
 | -------------------------------------------- | -------------------------- | -------------------------------------------------------------------------- |
-| v8.x                                         | v13      | [README](README.md)                                                        |
-| v7.x                                         | v12, v11, v10, v9, v8      | [README](README.md)                                                        |
+| v8.x                                         | v13                        | [README](README.md)                                                        |
+| v7.x                                         | v12, v11, v10, v9, v8      | [README](https://github.com/Nolanus/ngx-page-scroll/blob/v7.0.6/README.md) |
 | v6.x                                         | v8, v7                     | [README](https://github.com/Nolanus/ngx-page-scroll/blob/v6.0.2/README.md) |
 | v5.x                                         | v6                         | [README](https://github.com/Nolanus/ngx-page-scroll/blob/v5.0.1/README.md) |
 | v4.x                                         | v5, v4                     | [README](https://github.com/Nolanus/ngx-page-scroll/blob/v4.0.2/README.md) |