Documented supported versions

Toflar · Toflar · commit 310c03569a47 · 2021-12-21T08:50:16.000+01:00
diff --git a/README.md b/README.md
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 # PSR-6 compatible Symfony HttpCache Store
 
+## Supported branches
+
+* For PHP ^7.2 and Symfony <6, use version 3.x
+* For PHP ^8.0 and Symfony >6, use version 4.x
+
 ## Introduction
 
 Symfony's `HttpCache` store implementation is rather old and was developed
