add git local protocal support

tanhe123 · tanhe123 · commit 13b9c2c6be8d · 2017-08-18T17:27:30.000+08:00
diff --git a/backend b/backend
@@ -1 +1 @@
-Subproject commit 3199dacc5b42990dde52aa7e199042d2187132b1
+Subproject commit 99ac9cf20fd767fd38d781cd6f3092194f9d81c3
