chore(deps): update actions/cache action to v2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/cache	action	major	v1 -> v2

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Release Notes

actions/cache

v2

Compare Source

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[codecov]

Codecov Report

Merging #24 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #24   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           15        15           
  Branches         3         3           
=========================================
  Hits            15        15           

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