chore: updates the license badge
-# Substrate &middot; [![GitHub license](https://img.shields.io/github/license/paritytech/substrate)](LICENSE) [![GitLab Status](https://gitlab.parity.io/parity/substrate/badges/master/pipeline.svg)](https://gitlab.parity.io/parity/substrate/pipelines) [![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg)](docs/CONTRIBUTING.adoc)
+# Substrate &middot; [![GitHub license](https://img.shields.io/badge/license-GPL3%2FApache2-blue)](LICENSE) [![GitLab Status](https://gitlab.parity.io/parity/substrate/badges/master/pipeline.svg)](https://gitlab.parity.io/parity/substrate/pipelines) [![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg)](docs/CONTRIBUTING.adoc)
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<img src="/docs/media/sub.gif">
