chore: revise version support

Author: evenstensberg

SECURITY.md

@@ -8,8 +8,8 @@ webpack CLI is currently supporting webpack v4 and webpack v5. Security fixes ar
 
 | webpack version | webpack-cli version           | Supported          |
 | --------------- | ----------------------------- | ------------------ |
-| 4.x.0           | ^3.1.2                        | :white_check_mark: |
-| 4.0.x           | ^3.1.2                        | :white_check_mark: |
+| > 4.20.0        | ^3.1.2                        | :white_check_mark: |
+| 4.20.x          | ^3.1.2                        | :white_check_mark: |
 | 5.x.0           | ^3.1.2                        | :white_check_mark: |
 | 5.0.x           | ^3.1.2                        | :white_check_mark: |
 | < 4.x.x         | (CLI included in webpack < 4) | :x:                |