fix usage of iter_entry_points

[danielwelch]

see #276

[codecov-io]

Codecov Report

Merging #278 into master will decrease coverage by 2.46%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #278      +/-   ##
==========================================
- Coverage   92.74%   90.28%   -2.47%     
==========================================
  Files          42       42              
  Lines        2758     2758              
==========================================
- Hits         2558     2490      -68     
- Misses        200      268      +68

Impacted Files	Coverage Δ
django_q/conf.py	70.9% <0%> (ø)	⬆️
django_q/brokers/ironmq.py	0% <0%> (-94.74%)	⬇️
django_q/tests/test_brokers.py	70.58% <0%> (-11.77%)	⬇️
django_q/brokers/__init__.py	94.18% <0%> (-2.33%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 76ec0ae...c646686. Read the comment docs.

[jordanmkoncz]

Looks like this should resolve the issue. 👍

[jordanmkoncz]

Turns out there are still other issues to resolve, see #276 (comment).