Update README.md

Tr0sT · web-flow · commit 167e7d73fb83 · 2020-09-13T23:41:58.000+03:00
diff --git a/README.md b/README.md
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 # UnityScriptableObjectDatabase
 Database for scriptable objects in Unity using Odin Inspector
 
+## Requires
+Unity 2020.1.4 or later (C# 8)
+
 ## Installation
 You can install via git url by adding this entry in your **manifest.json**
 ```
