Update codecov.yml

[stevepeak]

Fix codecov.yml

• target is used a "coverage must be greater or equal to the target"
• threshold is the acceptable amount of loss to still consider the status as successful.

[codecov]

Codecov Report

Merging #5066 into 2.x will increase coverage by -0.03%.

@@             Coverage Diff              @@
##                2.x    #5066      +/-   ##
============================================
- Coverage     95.59%   95.56%   -0.03%     
+ Complexity     5543     5534       -9     
============================================
  Files           612      612              
  Lines         39575    39575              
  Branches       5554     5554              
============================================
- Hits          37830    37819      -11     
- Misses          763      768       +5     
- Partials        982      988       +6

Impacted Files	Coverage Δ	Complexity Δ
...internal/disposables/ArrayCompositeDisposable.java	92.85% <ø> (-7.15%)	15% <ø> (-1%)
.../java/io/reactivex/subjects/SerializedSubject.java	89.47% <ø> (-6.32%)	26% <ø> (-1%)
...main/java/io/reactivex/subjects/SingleSubject.java	95.23% <ø> (-4.77%)	38% <ø> (-2%)
...ternal/operators/completable/CompletableUsing.java	95.23% <ø> (-4.77%)	4% <ø> (ø)
...rnal/subscriptions/DeferredScalarSubscription.java	93.84% <ø> (-4.62%)	27% <ø> (-1%)
...erators/completable/CompletableConcatIterable.java	95.91% <ø> (-4.09%)	2% <ø> (ø)
...ernal/operators/maybe/MaybeTakeUntilPublisher.java	96% <ø> (-4%)	2% <ø> (ø)
.../internal/operators/flowable/FlowableInterval.java	93.33% <ø> (-3.34%)	2% <ø> (ø)
...ternal/operators/completable/CompletableCache.java	96.96% <ø> (-3.04%)	23% <ø> (-1%)
...activex/internal/operators/single/SingleCache.java	97.05% <ø> (-2.95%)	23% <ø> (-1%)
... and 31 more

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[akarnokd]

Thanks!