Update dependency mapbox-gl-leaflet to v0.0.4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
mapbox-gl-leaflet	dependencies	patch	0.0.3 -> 0.0.4	source

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Release Notes

mapbox/mapbox-gl-leaflet

### [`v0.0.4`](https://togithub.com/mapbox/mapbox-gl-leaflet/blob/master/CHANGELOG.md#​004---2019-02-27) [Compare Source](https://togithub.com/mapbox/mapbox-gl-leaflet/compare/v0.0.3...v0.0.4) ##### Added - UMD wrapper - support for `pane` in constructor ##### Fixed - webkitTransitionEnd event crash

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