Drop support for Python 2.

src/ifcopenshell-python/ifcopenshell/geom/occ_utils.py

@@ -17,20 +17,12 @@
 # along with IfcOpenShell.  If not, see <http://www.gnu.org/licenses/>.
 
 
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import random
 import operator
 import warnings
 
 from collections import namedtuple
-
-try:  # python 3.3+
-    from collections.abc import Iterable
-except ImportError:  # python 2
-    from collections import Iterable
+from collections.abc import Iterable
 
 import OCC