Remove patch number from GEDC.VERS payload

[tychonievich]

We currently say

It is recommended that implementations accept all data at their own or a lesser minor version, regardless of the patch version.

Given that recommendation, it would be simpler to simply write

0 HEAD
1 GEDC
2 VERS 7.0

instead of

0 HEAD
1 GEDC
2 VERS 7.0.1

See https://groups.google.com/g/gedcomgeneral/c/oMYUIt8afgQ for Peter's post suggesting this change.