Allow non-string messages to be concatenated

[wkeeling]

No description provided.

[codecov-io]

Codecov Report

Merging #9 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master       #9      +/-   ##
==========================================
+ Coverage   99.45%   99.46%   +0.01%     
==========================================
  Files           3        3              
  Lines         183      187       +4     
==========================================
+ Hits          182      186       +4     
  Misses          1        1

Impacted Files	Coverage Δ
ratelimitingfilter/ratelimitingfilter.py	98.63% <100%> (ø)	⬆️
tests/ratelimitingfilter_test.py	100% <100%> (ø)	⬆️

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