update geojson

Author: michaelkirk

geozero-core/Cargo.toml

@@ -24,7 +24,7 @@ all-features = true
 
 [dependencies]
 geozero = { version = "0.5", path = "../geozero" }
-geojson = { version = "0.18" }
+geojson = { version = "0.21" }
 geo-types = { version = "0.6", default-features = false }
 geos = { version = "7.0", optional = true }
 gdal = { version = "0.6", default-features = false, optional = true }