The v3.15.1 release is a patch release that addresses a regression in the v3.15.0 release. See the [v3.15.0 release notes](https://github.com/openlayers/openlayers/releases/tag/v3.15.0) for details on upgrading from v3.14.x.
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## Fixes
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* [#5190](https://github.com/openlayers/openlayers/pull/5190) - Revert "Batch polygon fill and stroke instructions" ([@ahocevar](https://github.com/ahocevar))