chore: switch http to https of submodule url (#108)

kezhenxu94 · web-flow · commit 3947a6cee420 · 2020-12-24T11:18:41.000+08:00
diff --git a/.gitmodules b/.gitmodules
@@ -1,3 +1,3 @@
 [submodule "protocol"]
 	path = protocol
-	url = http://github.com/apache/skywalking-data-collect-protocol
+	url = https://github.com/apache/skywalking-data-collect-protocol
