Version 2.0.0

Refactor only, nothing new. Contains breaking changes:

• Switch from defines to class constants to avoid namespace issues. This is not backwards compatible.

• Add phpdoc style comments to properties.

Version 1.1.0

Add DNSBL query capability:

• Add dnsQuery() method
• Add $dnsResponse property
• Add getDnsResponse() and setDnsResponse() methods
• Add query() wrapper method to call apiQuery() or dnsQuery() as appropriate
• Add $allowIpv6 parameter to ipIsValid() method
• Move test for whether or not a query has already occurred into query() method

Align the SFS_USER_AGENT version number with the release branch version number

Update documentation to reflect DNSBL query capability

Update example.php script to demonstrate DNSBL query capability