Update gerrit to 2.13.7 for mac

Change-Id: I7b4457a8c96c70109b595fa36d40c04546b25dee
diff --git a/macOS/Makefile b/macOS/Makefile
index 713197b..04fae44 100644
--- a/macOS/Makefile
+++ b/macOS/Makefile
@@ -1,4 +1,4 @@
-VERSION := 2.13.6
+VERSION := 2.13.7
 
 all: server
 
diff --git a/macOS/README.md b/macOS/README.md
index f8f7377..bb9bc00 100644
--- a/macOS/README.md
+++ b/macOS/README.md
@@ -8,5 +8,5 @@
 ```
   $ chmod a+x scripts/*
   $ chmod a+x uninstaller/scripts/*
-  $ make VERSION=2.13.6
+  $ make VERSION=2.13.7
 ```