1.7.0

• IMPORTANT: PHP 7.2 or greater is now required.
• The extension no longer depends on the pure PHP classes in
  maxmind-db/reader. You can use it independently.
• Type hints have been added to both the pure PHP implementation
  and the extension.
• The metadata method on the reader now returns a new copy of the
  metadata object rather than the actual object used by the reader.
• Work around PHP is_readable() bug. Reported by Ben Roberts. GitHub
  #92.
• This is the first release of the extension as a PECL package.
  GitHub #34.