Make change and version bump to r_aml_300900500 for mainline module file: manifest.json

Change-Id: I30d67bd81c64df9404a74b8921aa0b243564aa93
diff --git a/manifest.json b/manifest.json
index 056ece9..fd8bef6 100644
--- a/manifest.json
+++ b/manifest.json
@@ -1,4 +1,4 @@
 {
   "name": "com.android.sdkext",
-  "version": 300900400
+  "version": 300900500
 }