Plotly

Fixed
- Fix metaKeys field `PlotSchema.get()` output

Fixed
- Remove infinite loop when plotting 1-pt `scattergl` traces [[1168](https://github.com/plotly/plotly.js/pull/1168)]
- Fix updatemenu bug where the wrong button was set to active [[1176](https://github.com/plotly/plotly.js/pull/1176)]
- Fix `addTraces` when called with existing traces as input [[1175](https://github.com/plotly/plotly.js/pull/1175)]

Fixed
- Fix hover labels in stacked bar charts [[1163](https://github.com/plotly/plotly.js/pull/1163)]
- Fix mode bar zoom buttons on date axes [[1162](https://github.com/plotly/plotly.js/pull/1162)]

Fixed
- Fix annotation positioning on categorical axes [[1155](https://github.com/plotly/plotly.js/pull/1155)]

Added
- Allow date string inputs for axis ranges, `tick0`, `dtick`, annotation / image
positions, histogram bins [[1078](https://github.com/plotly/plotly.js/pull/1078), [#1150](https://github.com/plotly/plotly.js/pull/1150)]
- Add special `dtick` values for log axes [[1078](https://github.com/plotly/plotly.js/pull/1078)]
- Add `visible` attribute to annotations, shapes and images items [[1110](https://github.com/plotly/plotly.js/pull/1110)]
- Expose events on slider start/change/end [[1126](https://github.com/plotly/plotly.js/pull/1126)]
- Expose event on updatemenu button click [[1128](https://github.com/plotly/plotly.js/pull/1128)]
- Allow custom transform module to have supply layout default handler [[1122](https://github.com/plotly/plotly.js/pull/1122)]

Changed
- Increase `scattergl` precision [[1114](https://github.com/plotly/plotly.js/pull/1114)]
- Use `topojson-client` to convert topojson to geojson [[1147](https://github.com/plotly/plotly.js/pull/1147)]

Fixed
- Fix hover labels for multi-trace `scattergl` graphs (bug introduced in
`1.18.0`) [[1148](https://github.com/plotly/plotly.js/pull/1148)]
- Fix date format on hover on full hour [[1078](https://github.com/plotly/plotly.js/pull/1078)]
- Fix bar labels for non-zero `base` values [[1142](https://github.com/plotly/plotly.js/pull/1142)]
- Scatter colorscale now yield correct colors when cmin and cmax ashow re equal
[[1112](https://github.com/plotly/plotly.js/pull/1112)]
- Fix `filter` transform for categorical `target` arrays with range operations
[[1120](https://github.com/plotly/plotly.js/pull/1120)]
- Make sure frames with `null` values clear array containers [[1118](https://github.com/plotly/plotly.js/pull/1118)]
- Fix animations involving trace `opacity` [[1146](https://github.com/plotly/plotly.js/pull/1146)]
- Fix fallback for non-animatable trace modules (bug introduced in `1.18.1`)
[[1141](https://github.com/plotly/plotly.js/pull/1141)]
- Fix race condition in animation resolution when coupled with `relayout`
[[1108](https://github.com/plotly/plotly.js/pull/1108)]
- Enforce casting requested frame names to strings [[1124](https://github.com/plotly/plotly.js/pull/1124)]
- `Plotly.animte` no longer breaks when passing `null` frames [[1121](https://github.com/plotly/plotly.js/pull/1121)]
- `Plotly.PlotSchema.get` now correctly list rangeslider and rangeselector under
`xaxis` only [[1144](https://github.com/plotly/plotly.js/pull/1144)]
- `Plotly.relayout` correctly updates arbitrary layout attributes [[1133](https://github.com/plotly/plotly.js/pull/1133)]

Fixed
- Fix hover label positioning on bar traces [[1107](https://github.com/plotly/plotly.js/pull/1107)]