Update dependency typescript to v3.4.4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
typescript	devDependencies	patch	3.4.3 -> 3.4.4	homepage, source

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[codecov-io]

Codecov Report

Merging #45 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #45   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           1      1           
  Lines          37     37           
  Branches        3      3           
=====================================
  Hits           37     37

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