v0.1.1

Major changes:

Crucial fix of previous typo that made all dodgr_dist calculations wrong (Earth's radius is 6371, not 3671!) - thanks to @chrijo
weight_streetnet function now accepts data.frame objects defining wt_profile, enabling modification and direct re-submission of
dodgr::weighting_profiles
weighting_profiles$value modified to 0-1 scores rather than previous percentage values.
weight_streetnet flags any highway types not present in nominated or submitted weighting profile.
dodgr_paths now has additional pairwise parameter to enable paths only between matched pairs of from and to points (so returning n paths rather than n^2), thanks to @mem48.
dodgr_to_sf deprecated to dodgr_to_sfc (#43)

Added Malcolm Morgan (@mem48; bug-finder extraordinare) as contributor
Bug fix with dodgr_paths and simple data.frames, thanks to James Smith.
Bug fix of former improper handling of one-way edges, thanks to @chrijo.
match_pts_to_graph has additional connected parameter to allow points to be matched only to largest connected component.