WEB-2402 - update Egypt length to 29

[annsuparada]

Please replace these instructions with a description of your change. The
'New Fields Only' section should be removed if your pull request
doesn't add any new fields.

Thanks for your contribution!

A checklist is included below which helps us keep the code contributions
consistent and helps speed up the review process. You can add additional
commits to your pull request if you haven't met all of these points on your
first version.

All Changes

• Add an entry to the docs/changelog.rst describing the change.

• Add an entry for your name in the docs/authors.rst file if it's not
  already there.

New Fields Only

• Prefix the country code to all fields.

• Field names should be easily understood by developers from the target
  localflavor country. This means that English translations are usually
  not the best name unless it's for something standard like postal code,
  tax / VAT ID etc.

• Prefer 'PostalCodeField' for postal codes as it's
  international English; ZipCode is a term specific to the United
  States postal system.

• Add meaningful tests. 100% test coverage is not required but all
  validation edge cases should be covered.

• Add .. versionadded:: <next-version> comment markers to new
  localflavors.

• Add documentation for all fields.

[claudep]

Thanks for the patch! Could please also add an entry to docs/changelog.rst?
The commit message should refer to the open issue (like Fixed #423 - ...).

[claudep]

Sorry, by new entry I meant a line under the 3.1 header. As you can read, 3.1 is unreleased yet so any new changelog content should go under that future version.

[benkonrath]

This was fixed in #436.