Add python3 repo

twrp-extras.xml

@@ -10,6 +10,7 @@
 
 <!-- TWRP lives in TeamWin android-9.0 -->
     <project path="bootable/recovery" name="android_bootable_recovery" remote="TeamWin" revision="android-9.0"/>
+    <project path="external/python3" name="android_external_python3" remote="TeamWin" revision="android-9.0"/>
 
 <!-- Include external LineageOS repos for bash & nano -->
     <project name="android_external_bash" path="external/bash" remote="LineageOS" revision="cm-12.1" />