Update README.md

README.md

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 # Spacetris
-Yet another Tetris game but this time written in [.NET 7.0](https://dotnet.microsoft.com/en-us/download/dotnet/7.0) and [SFML](https://github.com/SFML/SFML). The project was created for fun in order to show how easily you can create a simple game in C# and SFML.
+Yet another Tetris game but this time written in [.NET 8.0](https://dotnet.microsoft.com/en-us/download/dotnet/8.0) and [SFML](https://github.com/SFML/SFML). The project was created for fun in order to show how easily you can create a simple game in C# and SFML.
 
 Videos
 ------------
-![Screenshot 1](https://github.com/kubagdynia/Spacetris/blob/develop/doc/spacetris_vid.gif)
+![Screenshot 1](./doc/spacetris_vid.gif)
 
 [Click to play on YouTube](https://youtu.be/LE38KHbw4Uk)
 
@@ -13,7 +13,7 @@ Music
 
 Build
 ------------
-First of all, you must have a [.NET 7.0](https://dotnet.microsoft.com/en-us/download/dotnet/7.0), then if you need an executable file, just run one of the following files
+First of all, you must have a [.NET 8.0](https://dotnet.microsoft.com/en-us/download/dotnet/8.0), then if you need an executable file, just run one of the following files
 * `build_debug.cmd`
 * `build_release.cmd`
 * `build_win_release_withoutconsolewindow.cmd`