chore(deps): update dependency typescript to v3.8.2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
typescript (source)	devDependencies	minor	3.7.5 -> 3.8.2

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[codecov]

Codecov Report

Merging #679 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #679   +/-   ##
=======================================
  Coverage   82.49%   82.49%           
=======================================
  Files          29       29           
  Lines         857      857           
=======================================
  Hits          707      707           
  Misses        150      150

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