Upgrade python/apitools to v0.5.30

Exempt-From-Owner-Approval: Upgrade library
Test: None
Change-Id: Ie13f61be98538e1ad04bfaf3ddb732e3c49022fe
diff --git a/METADATA b/METADATA
index feaa5b0..9c9b51c 100644
--- a/METADATA
+++ b/METADATA
@@ -9,10 +9,10 @@
     type: GIT
     value: "https://github.com/google/apitools"
   }
-  version: "v0.5.28"
+  version: "v0.5.30"
   last_upgrade_date {
     year: 2019
-    month: 5
-    day: 7
+    month: 6
+    day: 26
   }
 }