Update VERSION to 10.2.7

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Add release notes for the 10.2.7 release

Listing bugs fixed and changes made.

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
docs: Add sha256 sums for the 10.2.7 release

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>