remove outdated python2 statement

Author: tpaviot

examples/core_shape_properties.py

@@ -17,8 +17,6 @@
 ##You should have received a copy of the GNU Lesser General Public License
 ##along with pythonOCC.  If not, see <http://www.gnu.org/licenses/>.
 
-from __future__ import print_function
-
 from OCC.Core.BRepPrimAPI import BRepPrimAPI_MakeBox
 from OCC.Core.GProp import GProp_GProps
 from OCC.Core.BRepGProp import brepgprop_VolumeProperties, brepgprop_SurfaceProperties