Update dependency @types/jest to v25

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
@types/jest	devDependencies	major	24.9.1 -> 25.2.1

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[codecov[bot]]

Codecov Report

Merging #48 into master will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #48   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            5         5           
  Lines           41        41           
  Branches         3         3           
=========================================
  Hits            41        41