Merge pull request #179 from nowsprinting/chore/fix_readme

Fix alert level

Author: nowsprinting

README.md

@@ -524,7 +524,7 @@ public class MyTestClass
 > `FlipTexture2dEqualityComparer` is an optional functionality. To use it, you need to install the [FlipBinding.CSharp](https://www.nuget.org/packages/FlipBinding.CSharp) NuGet package v1.0.0 or newer.
 > Also, add scripting define symbol `ENABLE_FLIP_BINDING` if not installed via OpenUPM (UnityNuGet).
 
-> [!NOTE]  
+> [!IMPORTANT]  
 > When running on the Ubuntu 22.04 image (e.g., [GameCI](https://game.ci/) provided images), the GLIBCXX_3.4.32 (GCC 13+) required by FLIP's native libraries is missing.
 > So, you will need to create a custom Docker image that includes libstdc++6 from GCC 13.