Change clue/stream-filter name space

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Hello, I noticed that you have included clue\streamfilter via composer. Up until recently your plugin worked fine with the PostSMTP Mailer Plugin

The latest update somehow causes a namespace issue, and checkout fails in WooCommerce. You might want to consider changing the namespace as per https://deliciousbrains.com/php-scoper-namespace-composer-depencies/ since WordPress doesn’t like Composer.