Add Changelog

Author: hussainweb

CHANGELOG.md

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+
+2.0.0 / 2020-07-26
+==================
+
+* Create release for tags using GH Actions
+* Run PHPStan in Travis
+* Add phpstan and fix a type-hint
+* Add type information for parameters
+* Update tests on Travis
+* Add composer scripts
+* Move up the required version of PHP so that we are compatible with PSR-12
+* Remove PHP 7.1 from tests as we don't want to support an unsupported version of PHP.
+* Remove hhvm from tests and add PHP 7.4
+* Update to the latest PHPUnit
+* Update to the latest codesniffer
+* Change Travis test versions
+* Remove direct dependency on Guzzle.