Updated callout link URL in README

Author: tomakehurst

README.md

@@ -9,7 +9,7 @@
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 <img src="https://wiremock.org/images/wiremock-cloud/wiremock_cloud_logo.png" alt="WireMock Cloud Logo" height="20" align="left">
-<strong>WireMock open source is supported by <a href="https://www.wiremock.io/cloud-overview?utm_source=github.com&utm_campaign=wiremock-README.md-banner">WireMock Cloud</a>. Please consider trying it out if your team needs to collaborate on cloud-hosted mocks with advanced capabilities such as OpenAPI, dynamic state, data sources and more.</strong>
+<strong>WireMock open source is supported by <a href="https://www.wiremock.io/cloud-overview?utm_source=github.com&utm_campaign=wiremock-docker-README.md-banner">WireMock Cloud</a>. Please consider trying it out if your team needs to collaborate on cloud-hosted mocks with advanced capabilities such as OpenAPI, dynamic state, data sources and more.</strong>
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