Added fallback for django 1.11

[sheeshmohsin]

There is error when I tried to implement searchable select in django 1.11, I fixed it using the code in this pull request. Please review the code and merge it.

[coveralls]

Coverage decreased (-3.0%) to 97.015% when pulling 84308dc on sheeshmohsin:master into cd00c5d on and3rson:master.

[sheeshmohsin]

Hi, I am not able to detect what's failed? and also I am new to coveralls, so not sure what is decreased coverage? Can you please point me to the error or possible bugs in my code so that i can fix?

[and3rson]

@sheeshmohsin I will add info about testing coverage locally into readme in few minutes, stay tuned :)

[sheeshmohsin]

Cool, Thanks

[and3rson]

@shalakhin Please check out the updated readme, I've added info on how to run tests.
Your branch should now have both checks passing once you merge master in.

[and3rson]

@sheeshmohsin any luck? Simply merging master into your branch should do the trick :)

[sheeshmohsin]

@and3rson I will do by tonight (IST) after office. Thanks for the informations :)

[and3rson]

I've merged it manually, waiting for the tests

[sheeshmohsin]

Thanks, Apologies for the delay from my side, was bit busy