Update dependency codecov to v3.4.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
codecov	devDependencies	minor	3.3.0 -> 3.4.0	source

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Release Notes

codecov/codecov-node

v3.4.0

Compare Source

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[codecov-io]

Codecov Report

Merging #65 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #65   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           1      1           
  Lines          44     44           
  Branches        4      4           
=====================================
  Hits           44     44

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