Log Message:
(textproc/R-jsonlite) Updated 1.6.0 to 1.7.1

1.7.1
 - Always rename the 'sf_column' column to 'geometry' in toJSON(sf = 'geojson') \ 
because
   that is what the spec says.
 - Add asJSON method for ITime.
 - Fix toJSON() for encoding strings in multibyte locale on Windows
 - serializeJSON() now supports S4 "pseudo-null" (i.e. empty slots)

1.7.0
 - Add support for 'sf' classes in toJSON() conform GeoJSON spec.
 - Fix a unit test due to a change in rgdal

1.6.1
 - Fix bug in C_collapse_array_pretty_inner declarationdetected by CRAN LTO
 - Better handing of NA in timestamps with POSIXt = 'mongo'
 - The 'raw' parameter in toJSON gains options 'int' and 'js'