README: remove Debian Stretch

There are build problems with go generate (caused by stringer) in Debian
Stretch's backports version of Go.

diff --git a/README b/README
index 278f5a149ddb780ba44839a27a850f7b7b4b807a..6a0a97b02ea4199f8bc2c582ee053a6e733e368e 100644 (file)
--- a/README
+++ b/README
@@ -56,9 +56,9 @@ nsscash is licensed under AGPL version 3 or later.
   - github.com/BurntSushi/toml
 - C compiler, for `libnss_cash.so.2`
 
-Tested on Debian Stretch and Buster, but should work on any GNU/Linux system.
-With adaptations to the NSS module it should work on any UNIX-like system
-which uses NSS.
+Tested on Debian Buster, but should work on any GNU/Linux system. With
+adaptations to the NSS module it should work on any UNIX-like system which
+uses NSS.
 
 
 == USAGE