Add WsdlToPhp/PackageGenerator (#748)

* Add WsdlToPhp/PackageGenerator

* Remove `wsdl2phpgenerator` as it is no longer maintained

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Co-authored-by: Alexander Kartavenko <askemailbox@gmail.com>

README.md

 * [Jane](https://github.com/janephp/janephp/) - An OpenApi client generator with validation support.
 * [Negotiation](https://github.com/willdurand/Negotiation) - A content negotiation library.
 * [Restler](https://github.com/Luracast/Restler) - A lightweight framework to expose PHP methods as RESTful web API.
-* [wsdl2phpgenerator](https://github.com/wsdl2phpgenerator/wsdl2phpgenerator) - A tool to generate PHP classes from SOAP WSDL files.
+* [PackageGenerator](https://github.com/WsdlToPhp/PackageGenerator) - Package Generator generates a PHP SDK from any WSDL.
 
 ### Caching and Locking
 *Libraries for caching data and acquiring locks.*