Machine imports withou try except

Python 2 is not supported now. The import is the same in try and except.

offlineimap/ui/Machine.py

@@ -13,9 +13,6 @@
 #    You should have received a copy of the GNU General Public License
 #    along with this program; if not, write to the Free Software
 #    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
-try:
-    from urllib.parse import urlencode
-except ImportError: # python3
 from urllib.parse import urlencode
 import sys
 import time