Update README.md

vearutop · Jan 17, 2021 · b2dc24e · b2dc24e
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@@ -24,6 +24,9 @@ are quite important. Previous solutions (for example [`vfsgen`](https://github.c
 with [`httpgzip`](https://github.com/shurcooL/httpgzip)) can optimize performance by storing compressed assets and
 serving them directly to capable user agents. This library implements such functionality for embedded file systems.
 
+> **_NOTE:_** Unfortunately guarding new api with build tags is not a viable option, since it imposes 
+> [issues](https://github.com/golang/go/issues/43400) in older versions of Go.
+
 ## Example
 
 ```go