fix typo

[d-tsuji]

Issue #, if available:

Nothing.

Description of changes:

Fix minor typo.

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[codecov-commenter]

Codecov Report

Merging #376 (9c15b8c) into master (159d1c6) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #376   +/-   ##
=======================================
  Coverage   72.22%   72.22%           
=======================================
  Files          19       19           
  Lines         738      738           
=======================================
  Hits          533      533           
  Misses        138      138           
  Partials       67       67           

Impacted Files	Coverage Δ
lambda/entry.go	75.00% <ø> (ø)

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[bmoffatt]

Thanks!