Merge branch 'hotfix-3.5.2'
update history method description

and add include_timetoken example
update readme

replace obsolete examples(named args => positional args)
remove default publish_key and subscribe_key
add alias detailedHistory() => history()
remove mistakenly added test file
fix composer example in readme
bump version to 3.5.3
Merge branch 'hotfix-3.5.3' into develop

Conflicts:
	composer/lib/Pubnub/Pubnub.php
	core/src/Pubnub.php_
	legacy/Pubnub.php
	tests/unit/PublishTest.php