setup_gjf.sh: Add support for version 1.7

Change-Id: I0eb1533a85b4002af17cc355c7d20074861f6b31
diff --git a/tools/setup_gjf.sh b/tools/setup_gjf.sh
index de2e0cc..c450811 100755
--- a/tools/setup_gjf.sh
+++ b/tools/setup_gjf.sh
@@ -29,6 +29,9 @@
 1.6)
     SHA1="02b3e84e52d2473e2c4868189709905a51647d03"
     ;;
+1.7)
+    SHA1="b6d34a51e579b08db7c624505bdf9af4397f1702"
+    ;;
 *)
     echo "unknown google-java-format version: $VERSION"
     exit 1