Fix typo in chain_test.go

[RJPercival]

No description provided.

[codecov-io]

Codecov Report

Merging #153 into master will decrease coverage by 0.16%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #153      +/-   ##
==========================================
- Coverage   73.33%   73.17%   -0.17%     
==========================================
  Files          36       36              
  Lines        1305     1327      +22     
==========================================
+ Hits          957      971      +14     
- Misses        300      307       +7     
- Partials       48       49       +1

Impacted Files	Coverage Δ
retry/backoff.go	50% <0%> (-50%)	⬇️
util/backoffutils/backoff.go	60% <0%> (-40%)	⬇️
retry/retry.go	76.11% <0%> (+2.01%)	⬆️

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