libphonenumber-for-php v8 released

[giggsey]

Hi,

libphonenumber-for-php v8 has been released, and it'll be good for this project to support it going forwards.

The BC changes are:

• Convert from PSR-0 to PSR-4
• Remove deprecated ShortNumberUtil, use ShortNumberInfo instead
• Deleting deprecated methods in ShortNumberInfo that work on strings, instead
  of phone number objects. These have been marked deprecated for months. Any
  users of these methods should call PhoneNumberUtil::parse first to create a
  PhoneNumber object, and pass this in.
• Support semicolon as extension character while parsing phone numbers.

[Borales]

@giggsey awesome, thanks for the report, I'll do the upgrade.