doc: HACKING: drop bit about Debian 9.x (stretch)

It's oldoldstable, by now; just refer to Debian stable as
the primary but keep LTS distros in mind because stuff like
CentOS 7.x needs to remain supported.

diff --git a/HACKING b/HACKING
index 1070d3ff341fc6bc7f78e8a43078718f5e9a1094..df68b54d0f40b283cc5bf6abef618f7a75a89f71 100644 (file)
--- a/HACKING
+++ b/HACKING
@@ -30,9 +30,8 @@ This includes folks on slow connections and ancient browsers which
 may be too difficult to upgrade due to resource demands.
 
 Only depend on Free Software packages which exist in the "main"
-section of Debian "stable" distribution.  That is Debian 9.x
-("stretch") as of this writing, but "oldstable" (8.x, "jessie")
-remains supported for v1 inboxes.
+section of Debian "stable" distribution; but continue to support
+any LTS distros within their support window.
 
 In general, we favor mature and well-tested old things rather than
 the shiny new.