solution not correct of threat grid mission

[chrivand]

https://github.com/CiscoDevNet/dne-security-code/blob/v1.1-solutions/intro-threatgrid/mission/thgrid_mission.py

not correct, time should be wider. I changed it to

"/search/submissions?after=2010-07-18T21:39:13Z&q={}"

then I got 44 hits, otherwise not much...

[annegentle]

@chrivand can you fix?

[chrivand]

Ok! Will check it out later

[chrivand]

#38