allow 1 percent codecov degradation before failing build (because it is flaky)

[cyberw]

No description provided.

[codecov]

Codecov Report

Merging #1230 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1230   +/-   ##
=======================================
  Coverage   78.67%   78.67%           
=======================================
  Files          20       20           
  Lines        1955     1955           
  Branches      308      308           
=======================================
  Hits         1538     1538           
  Misses        336      336           
  Partials       81       81

Impacted Files	Coverage Δ
locust/util/deprecation.py	85% <0%> (ø)	⬆️
locust/contrib/fasthttp.py	91.17% <0%> (ø)	⬆️
locust/web.py	89.05% <0%> (ø)	⬆️
locust/main.py	34.42% <0%> (ø)	⬆️
locust/core.py	87.71% <0%> (ø)	⬆️
locust/runners.py	78.33% <0%> (ø)	⬆️

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[cyberw]

Great, we had just the right amount of flakyness in the build to validate my change :P