Allow code coverage to drop by 0.2%.

[marcinslusarz]

Even if we could fix tests to always hit all code paths, we can't fix gcov (which sometimes reports impossible coverage changes). The only sane solution is to allow coverage to drop by some small number. 0.2% seems to be enough to cover most problems.

https://docs.codecov.io/docs/commit-status#section-threshold

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This change is 

[codecov[bot]]

Codecov Report

Merging #352 into master will decrease coverage by 0.03%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #352      +/-   ##
==========================================
- Coverage   75.05%   75.01%   -0.04%     
==========================================
  Files          64       64              
  Lines        7921     7921              
  Branches     1589     1589              
==========================================
- Hits         5945     5942       -3     
- Misses       1479     1481       +2     
- Partials      497      498       +1

Flag	Coverage Δ
#sqlite_tests	45.88% <ø> (-0.04%)	:arrow_down:
#tests_antool	12.54% <ø> (ø)	:arrow_up:
#tests_posix_multi_threaded	25.89% <ø> (-0.06%)	:arrow_down:
#tests_posix_single_threaded	56% <ø> (+0.02%)	:arrow_up:
#tests_preload	46.11% <ø> (-0.1%)	:arrow_down:

Impacted Files	Coverage Δ
src/libpmemfile-posix/dir.c	85.25% <0%> (-0.5%)	:arrow_down:
src/libpmemfile-posix/file.c	70.67% <0%> (-0.28%)	:arrow_down:

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[krzycz]

Reviewed 1 of 1 files at r1. Review status: all files reviewed at latest revision, all discussions resolved.

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Comments from Reviewable

[ldorau]

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Reviewed 1 of 1 files at r1. Review status: :shipit: all files reviewed at latest revision, all discussions resolved, all commit checks successful.

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Comments from Reviewable

[sarahjelinek]

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Reviewed 1 of 1 files at r1. Review status: :shipit: all files reviewed at latest revision, all discussions resolved, all commit checks successful.

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Comments from Reviewable