using cdk 1.28.0

[jsdtaylor]

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[codecov]

Codecov Report

Merging #18 into master will not change coverage by %.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #18   +/-   ##
=======================================
  Coverage   68.57%   68.57%           
=======================================
  Files           1        1           
  Lines          35       35           
  Branches        7        7           
=======================================
  Hits           24       24           
  Misses         11       11           

Impacted Files	Coverage Δ
lib/index.ts	68.57% <100.00%> (ø)

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