Upgrade to support newer PHP versions

• Removed support for versions lower than 7.1, and add support for 8.0+
• Addd return types for Interpreter and Soap to avoid warnings in PHP 8.0+

Special thanks to @DRoet who raised #19. This made me aware of this library need an upgrade to catch up with newer PHP versions.

Given the support for PHP 7.1 or earlier are dropped, this version (v2.0.0) is not backward compatible. If you need library with PHP 7.0 or earlier, please use v1.0.3 instead.

Fix unit tests

• Changed to use local WSDL files for unit tests
• Added more examples in README
• Fixed a typo in comment
• Replaced travis with github actions

1.0.2

• Clarify the supported constructor options for Interpreter in comments and README. The unsupported options (debugging and HTTP transport) are explicitly unset when initialise Interpreter. This is backward compatible as those options should have no effect to the behaviour of this library.
• More test.
• Better comments.
• Better README.

Bug Fix

Ensure SOAP response is set to null when SoapFault is throw, so subsequent requests will not be affected.

Enable response without firstly invoking request in wsdl mode

This is not backward compatible as Interpreter::response now requires a new arg function_name in order to interpret the SOAP response message correctly in wsdl mode.

Add support for output headers

Like SoapClient::__soapCall, Interpreter::response can now fill the given headers from the SOAP response.
Although response method add a new argument, it is still backward compatible because the new argument has default values.

First Release

0.1.0

Update README.md