Note 8.3 requirement in README

Author: Goooler

README.md

@@ -21,6 +21,7 @@ Read the [User Guide](https://imperceptiblethoughts.com/shadow/)!
 | 5.x            | 5.2.0 - 6.0.0  |
 | 6.x            | 5.2.0 - 6.1.0  |
 | 7.x            | 7.0.0+         |
-| 8.x            | 8.0.0+         |
+| 8.0 - 8.2.x    | 8.0.0+         |
+| 8.3+           | 8.3.0+         |
 
 **NOTE**: Shadow v5.+ is compatible with Gradle 5.x - 6.x and Java 7 - 15 _only_, v6.1.0+ requires Java 8+.