Convert to f-strings

[Koed00]

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[Koed00]

Codecov Report

Merging #415 into master will increase coverage by 0.08%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #415      +/-   ##
==========================================
+ Coverage   90.66%   90.75%   +0.08%     
==========================================
  Files          43       43              
  Lines        2926     2930       +4     
==========================================
+ Hits         2653     2659       +6     
+ Misses        273      271       -2     

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[codecov-io]

Codecov Report

Merging #415 into master will increase coverage by 0.08%.
The diff coverage is 95.34%.

@@            Coverage Diff             @@
##           master     #415      +/-   ##
==========================================
+ Coverage   90.66%   90.75%   +0.08%     
==========================================
  Files          43       43              
  Lines        2926     2930       +4     
==========================================
+ Hits         2653     2659       +6     
+ Misses        273      271       -2

Impacted Files	Coverage Δ
django_q/signals.py	100% <100%> (+8.33%)	⬆️
django_q/brokers/orm.py	97.95% <100%> (ø)	⬆️
django_q/brokers/mongo.py	100% <100%> (ø)	⬆️
django_q/management/commands/qinfo.py	95.45% <100%> (ø)	⬆️
django_q/brokers/redis_broker.py	95.91% <100%> (ø)	⬆️
django_q/tests/tasks.py	92.3% <100%> (ø)	⬆️
django_q/status.py	97.5% <100%> (ø)	⬆️
django_q/monitor.py	83.33% <85%> (ø)	⬆️
django_q/cluster.py	91.99% <93.47%> (+0.07%)	⬆️
django_q/brokers/disque.py	98% <94.73%> (ø)	⬆️
... and 3 more

---

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 a1543c8...7c31c24. Read the comment docs.