Adjusted README to clarify it backs up server data (#210)

Author: itzg

README.md

@@ -2,7 +2,7 @@
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-Provides a side-car container to back up [itzg/minecraft-server](https://github.com/itzg/docker-minecraft-server) world data. Backups are coordinated automatically by using RCON to flush data, pause writes, and resume after backup is completed. 
+Provides a side-car container to back up [itzg/minecraft-server](https://github.com/itzg/docker-minecraft-server) server data. Backups are coordinated automatically by using RCON to flush data, pause writes, and resume after backup is completed. 
 
 **This does NOT support Bedrock edition. Use [a community provided solution](https://github.com/itzg/docker-minecraft-bedrock-server#community-solutions) for that.**