manifest: android-8.1.0_r15 -> android-8.1.0_r20

Change-Id: I90b75ab9f6c127152cbca802678c6d51970f7ce3
1 file changed
tree: 09289712822e4817a645ee755c0a90ad2342d0a4
  1. snippets/
  2. default.xml
  3. README.mkdn