docs: ✏️ fix FeaturesProvider import

[samyilias]

feature-toggle-jsx README example import and usage of FeaturesProvider
was wrong, this commit will change FeatureProvider to FeaturesProvider

✅ Closes: #648

[samyilias]

@ches @kanokgan I need approval for CI :)

[codecov]

Codecov Report

Merging #649 (bb0a5b1) into master (dbf36de) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #649   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           29        29           
  Lines          281       303   +22     
  Branches        63        71    +8     
=========================================
+ Hits           281       303   +22     

Impacted Files	Coverage Δ
packages/ab-test-jsx/src/withABTest/withABTest.tsx	100.00% <ø> (ø)
...ckages/ab-test-jsx/src/withABTests/withABTests.tsx	100.00% <ø> (ø)
...fast-number-formatter/src/numberFormatter/index.ts	100.00% <ø> (ø)
...feature-toggle-jsx/src/withFeature/withFeature.tsx	100.00% <ø> (ø)
...e-toggle-jsx/src/withoutFeature/withoutFeature.tsx	100.00% <ø> (ø)
packages/i18n-jsx/src/useI18n/useI18n.tsx	100.00% <ø> (ø)
.../some-handy-hooks/src/useCountdown/useCountdown.ts	100.00% <ø> (ø)
...sx/src/withABTestsProvider/withABTestsProvider.tsx	100.00% <100.00%> (ø)
...ry-jsx/src/withErrorBoundary/withErrorBoundary.tsx	100.00% <100.00%> (ø)
.../src/withFeaturesProvider/withFeaturesProvider.tsx	100.00% <100.00%> (ø)
... and 10 more

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[matmalkowski]

🎉 This PR is included in version feature-toggle-jsx-v4.0.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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