Semver issue ^7.1.0

[mcbain]

Despite linking to @turf/bbox:7.1.0 it uses the 7.2.0 of @turf/helpers due to the ^7.1.0 version.
This is the case for all turf packages. The only workaround is to set the 7.1.0 version for ALL turf packages in resolutions of importing package.json. Turf is build from a single source repo so IMO packages should link with a single fixed version e.g 7.1.0 to prevent a version mixture