Add version-info

Signed-off-by: Christoph Paasch <christoph.paasch@uclouvain.be>
diff --git a/net/mptcp/mptcp_ctrl.c b/net/mptcp/mptcp_ctrl.c
index e97b3b7..b7f2ba1 100644
--- a/net/mptcp/mptcp_ctrl.c
+++ b/net/mptcp/mptcp_ctrl.c
@@ -1611,6 +1611,8 @@
 		goto register_sysctl_failed;
 #endif
 
+	pr_info("MPTCP: Stable release v0.86.1");
+
 out:
 	return;