Update service-mesh.proto (#32)

diff --git a/service-mesh-probe/service-mesh.proto b/service-mesh-probe/service-mesh.proto
index b54ff95..5cbbfa0 100644
--- a/service-mesh-probe/service-mesh.proto
+++ b/service-mesh-probe/service-mesh.proto
@@ -48,6 +48,7 @@
     bool status = 10;
     Protocol protocol = 11;
     DetectPoint detectPoint = 12;
+    string tlsMode = 13;
 }
 
 enum Protocol {