v4.0.0

This is the full GA release for the v4.0.0 changes described in #197.

From the changelog:

Breaking Changes ⚠️

• Support for the Mapbox GL JS 0.47.0 API. This is compatible with 0.47.0 and later, and may not be compatible with earlier versions #219.
• Obtain language from user's browser settings #195
• Localize placeholder based on language set in constructor options #150
• trackProximity turned on by default #195

Features / Improvements 🚀

• Mapbox events upgraded to v0.2.0 for better handling #212
• Pass flyTo options to the map on result selection on both map#flyTo and map#fitBounds operations #214 and #227
• Bump suggestions dependency to v1.4.x
• Adds the marker constructor option that allows adding the selected result to the map as a marker. Adding the marker to the map is now the default behavior. #219.
• Add get and set methods for constructor options #226
• Add collapsed option to collapse the geocoder controller into a button until hovered or focused #222
• Expose clear as public method #115

Bug Fixes 🐛

• Upgrade dev dependencies #216
• Remove hardcoded IDs in bounding box exception list #217
• Fix double map moveend event #229
• Fix duplicate result event bug #218
• Fix trapped focus bug #220