Fix release date

[olexandr-konovalov]

The date in the latest release breaks validation:

* TransGrp - new version 2.0.3 discovered!!!
  ============================================
  Getting new archives from 
  http://www.math.colostate.edu/~hulpke/transgrp/transgrp2.0.3[ ".tar.gz" ]
  unpacking transgrp2.0.3.tar.gz
#E  component `Date' must be bound to a string of the form `dd/mm/yyyy'
  ERROR (TransGrp): validation of the info file not successful! SKIPPING!!!

Could you please fix it accordingly to the comments that someone placed above it in PackageInfo.g file:

transgrp/PackageInfo.g

Lines 13 to 16 in 55a90d6

	## Release date of the current version in dd/mm/yyyy format.
	## Note that the clever package tools cannot deal with single digits, but
	## will whine.
	Date := "8/31/2018",

Note that using ReleaseTools would report this immediately and allow to avoid this situation. If you're not using ReleaseTools, you still can call ValidatePackageInfo locally before publishing the release.

[fingolfin]

Note that there are two problems: 8 should be 08, and the order of day and month are switched.

[olexandr-konovalov]

Also, the date need not to be in the future.

[hulpke]

Fixed. (Is there a reason not to allow single digit numbers?)

[olexandr-konovalov]

Thanks. It is a consistent style that is in use for more than 10 years - I can track lines in ValidatePackageInfo.g which require this format being unchanged since

changeset:   15110:291ee24f4089
user:        Thomas Breuer 
date:        Wed Nov 26 16:16:00 2008 +0000
summary:     split `lib/package.g' into `lib/package.gd' and `lib/package.gi',