README.md: Tweak text about BuildStream

BuildStream no longer uses libostree internally (see
https://gitlab.com/BuildStream/buildstream/issues/387). It still
has first class support for interoperating with libostree repos.

diff --git a/README.md b/README.md
index a4146f0497c68385efc3b8ea09565c9f24dff5b9..1e6348dd6f232943592b229ccb34b9cacabc4327 100644 (file)
--- a/README.md
+++ b/README.md
@@ -74,8 +74,7 @@ systems.
 which uses libostree.
 
 The [BuildStream](https://gitlab.com/BuildStream/buildstream) build and
-integration tool uses libostree as a caching system to store and share
-built artifacts.
+integration tool supports importing and exporting from libostree repos.
 
 Fedora [coreos-assembler](https://github.com/coreos/coreos-assembler) is
 the build tool used to generate Fedora CoreOS derivatives.