* update stories from storiesOf format to CSF with storybook upgrade to 5.2.8 
* test: update vrt snapshots as a result of url changing for vrts

BREAKING CHANGE: renames in `Partition` charts— `Layers`: `fillLabel.formatter`->`fillLabel.valueFormatter`; type `FillLabel`-> `FillLabelConfig`

Non-breaking changes:

* feat: the values in linked labels are rendered, just like they have been in the sectors (formerly, the value could optionally be put in the link label accessor itself)

* feat: font styling is possible separately for values: `valueFormatter` configs

* test: opacity decrease example; coloring examples

* feat: hierarchical data (`parent`, `sortIndex`) is made available to accessors (see stories, helpful with eg. coloring)

* refactor: tighter types; other code improvements

This commit changes the object passed to the event listeners providing either the value of the
clicked/hovered element and the SeriesIdentifier object that can uniquely identify a series in elastic-charts. (see #419 for a description on SeriesIdentifiers)

BREAKING CHANGE: the `onElementOver` and the `onElementClick` are now called with
`Array<[GeometryValue, SeriesIdentifier]>` instead of `Array<GeometryValue>`

fix #505

This commit fix the brush values when the chart is rotated.

fix #527

Co-authored-by: Nick Partridge <nick.ryan.partridge@gmail.com>

# [17.0.0](v16.2.1...v17.0.0) (2020-01-30)

### Bug Fixes

* **brush:** rotate brush on rotated charts ([#528](#528)) ([985ac21](985ac21)), closes [#527](#527)

### Features

* text improvements ([#524](#524)) ([6e61700](6e61700))
* **listeners:** add seriesIdentifiers to element listeners ([#525](#525)) ([027d008](027d008)), closes [#419](#419) [#505](#505)

### BREAKING CHANGES

* **listeners:** the `onElementOver` and the `onElementClick` are now called with
`Array<[GeometryValue, SeriesIdentifier]>` instead of `Array<GeometryValue>`
* renames in `Partition` charts— `Layers`: `fillLabel.formatter`->`fillLabel.valueFormatter`; type `FillLabel`-> `FillLabelConfig`

Non-breaking changes:

* feat: the values in linked labels are rendered, just like they have been in the sectors (formerly, the value could optionally be put in the link label accessor itself)

* feat: font styling is possible separately for values: `valueFormatter` configs

* test: opacity decrease example; coloring examples

* feat: hierarchical data (`parent`, `sortIndex`) is made available to accessors (see stories, helpful with eg. coloring)

* refactor: tighter types; other code improvements