Merge pull request #182 from djnugent/takeoff_fix

Fixed import error for takeoff checks

Author: tcr3dr

droneapi/module/api.py

@@ -3,6 +3,7 @@
 import threading
 import traceback
 import logging
+import math
 from pymavlink import mavutil
 from MAVProxy.modules.lib import mp_module
 from droneapi.lib.WebClient import *