Bump the Python version number for Cura.

CURA-2150 Upgrade to PyQt 5.6 and Python 3.5

CMakeLists.txt

@@ -25,7 +25,7 @@ if(NOT ${URANIUM_SCRIPTS_DIR} STREQUAL "")
     CREATE_TRANSLATION_TARGETS()
 endif()
 
-find_package(PythonInterp 3.4.0 REQUIRED)
+find_package(PythonInterp 3.5.0 REQUIRED)
 
 install(DIRECTORY resources
         DESTINATION ${CMAKE_INSTALL_DATADIR}/cura)