[PROJ] PROJ 6.3.0RC1

[Even Rouault]

> Europe-1.5RC1:
> 
> http://download.osgeo.org/proj/proj-datumgrid-europe-1.5RC1.zip

A RC2 will be needed for that one. BWTA2017.gsb is the git-lfs text file, not 
the actual content.
I committed the .gitattributes file only on Dec 20 whereas the .gsb file was 
committed on Nov 30, so if you have "git pull" in-between, that might perhaps 
explain you only got the link and not the actual content. (Testing a fresh git 
clone with git-lfs in the PATH correctly retrieves the file.)

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