add .git suffix to the submodule url

guanqun · Guanqun Lu · commit 131c168655b2 · 2019-08-26T00:45:19.000+08:00
diff --git a/.gitmodules b/.gitmodules
@@ -1,3 +1,3 @@
 [submodule "curl-sys/curl"]
 	path = curl-sys/curl
-	url = https://github.com/curl/curl
+	url = https://github.com/curl/curl.git
