[Matrix] set xbmc.python to 3.0.0 (xbmc#1286)

Author: ronie

targets.cfg

@@ -77,10 +77,10 @@ minversions =
  xbmc.addon:12.0.0
 
 [matrix]
-branches = gotham,helix,isengard,jarvis,krypton,leia,matrix
+branches = matrix
 minversions =
  xbmc.gui:5.14.0,
- xbmc.python:2.1.0,
+ xbmc.python:3.0.0,
  xbmc.json:6.0.0,
  xbmc.metadata:1.0,
  xbmc.addon:12.0.0