Switch ALPN/NPN to advertise only h2
diff --git a/src/core/transport/chttp2/alpn.c b/src/core/transport/chttp2/alpn.c
index 3ccd579..69da4e6 100644
--- a/src/core/transport/chttp2/alpn.c
+++ b/src/core/transport/chttp2/alpn.c
@@ -36,8 +36,7 @@
#include <grpc/support/useful.h>
/* in order of preference */
-static const char *const supported_versions[] = {"h2", "h2-17", "h2-16",
- "h2-15", "h2-14"};
+static const char *const supported_versions[] = {"h2"};
int grpc_chttp2_is_alpn_version_supported(const char *version, size_t size) {
size_t i;