support more PHP versions and Guzzle 7 #140
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adds travis testing for php versions 7.2, 7.3, 7.4 and 8.0
(php 7.0 and 7.1 don't get the correct version of phpunit and thus fails)
update invalid function definitions which has required params after
optional ones (php8.0 refuses to build with these errors)
add guzzle 7 support
closes #119
closes #129