Support newer PHP versions

• Added support for PHP 8.0+
• Upgraded php-soap-interpreter

Remove concrete PSR dependency and Support PHP 7.1+

• Removed dependency on specific implementation of PSR-7 and started to use PSR-17 factory interfaces instead.
• Removed support for php 5.6 as it is too old.

Support from php 5.6

• Removed support for php 5.4 as it is too old
• Changed to use Github actions to automate unit tests

Replace deprecated diactoros

Thanks @andrewtweber, we now have replaced the deprecated zend diactoros.

Better comments for `HttpBinding`

0.2.3

Update README.md

0.2.2

Close body stream if HTTP binding failed.

0.2.1

• Use Zend Diactoros stream instead of PHP native stream
• Improve phpdoc.

0.2.0

Add a HttpBinding class to integrate SOAP interpreter and RequestBuilder.

0.1.2

• Improved validation
• Improved HTTP headers preparation - content length is from getSize rather than strlen.
• Added more tests.

Add keywords in composer.json

Update composer.json

add missed common.