fix: wrong workflow name

Author: greg6775

README.md

@@ -1,6 +1,6 @@
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-[![Build](https://github.com/itzg/docker-minecraft-bedrock-server/workflows/Build/badge.svg)](https://github.com/itzg/docker-minecraft-bedrock-server/actions?query=workflow%3ABuild)
+[![Build](https://github.com/itzg/docker-minecraft-bedrock-server/workflows/CI/badge.svg)](https://github.com/itzg/docker-minecraft-bedrock-server/actions?query=workflow%3ACI)
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