fix: classifier break count must >= features.length - 1

[rgwozdz]

Fix for https://github.com/koopjs/koop/issues/1019.

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🦋 Changeset detected

Latest commit: c7f72c2ae9664ab4d3e57ed15d9277aa73c1a6d2

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 4 packages

| Name | Type | | -------------------------- | ----- | | @koopjs/winnow | Patch | | @koopjs/featureserver | Patch | | @koopjs/output-geoservices | Patch | | @koopjs/koop-core | Patch |

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Coverage Report (change vs master)

File Path	Statements	Branches	Functions	Lines
packages/winnow/src/calculate-class-breaks/index.js	100.0 vs 90.3	100.0 vs 80.0	100.0 vs 100.0	100.0 vs 92.8