Update street-centerlines.md

[Kistine]

Dataset was recently refreshed so adding the links ESRI makes since they recently altered their urls

[rcheetham]

@Kistine these edits look like they work, but before I approved, I wanted to make sure you intended the change from SRID 4326 to 3857 on the CSV and Shapefil but adding 4326 to the GeoJSON

[Kistine]

@rcheetham these are pre-made by ESRI that way