switch default versioning method
switch default versioning method

Fixes https://github.com/kivy/buildozer/issues/236.
inclement/buildozer,rnixx/buildozer,kivy/buildozer,inclement/buildozer,inclement/buildozer,rnixx/buildozer,rnixx/buildozer,kived/buildozer,kived/buildozer,kivy/buildozer,rnixx/buildozer,kivy/buildozer,inclement/buildozer,kivy/buildozer