Spelling correction for 'email' within NOTICE OF LICENSE

Whilst accepted as correct, e-mail is a 1980s: abbreviation of electronic mail.
As such should be correctly spelt as 'e-mail' and not 'email'.
This commit corrects the spelling within the NOTICE OF LICENSE header.
Future commits can then be made to correct further misspellings with adequate testing.

This replaces the line...
 * obtain it through the world-wide-web, please send an email
to...
 * obtain it through the world-wide-web, please send an e-mail

Please feel free to check any major dictionary.
http://www.thefreedictionary.com/email