[PROJ] PROJ 6.3.0RC1

[Even Rouault]

> North-America-1.3RC1:
> 
> http://download.osgeo.org/proj/proj-datumgrid-north-america-latest.zip

Should read:
https://download.osgeo.org/proj/proj-datumgrid-north-america-1.3RC1.zip

> - Regenerated g2018u0.gtx and g2018p0.gtx files prompted by error in 
previous versions

This entry could be removed as Geoid2018 was just added in 1.3, so the 
incorrect grids were just a transient state in master.

Even

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