Update dependency @types/jest to v24.0.21

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
@types/jest	devDependencies	patch	24.0.20 -> 24.0.21

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[codecov[bot]]

Codecov Report

Merging #30 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #30   +/-   ##
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  Coverage     100%   100%           
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  Files           5      5           
  Lines          41     41           
  Branches        3      3           
=====================================
  Hits           41     41