Issue Description:

20.06 20:27:52 [Server] INFO [dynmap] Opening MySQL database mysql.apexhosting.gdn:3306/apexMC741534 as map store
20.06 20:27:52 [Server] WARN Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.

Using old depreciated driver for MySQL integration, needs to be updated.

• Dynmap Version: v3.1-457*
• Server Version: paper 1.16.5 build 778
• Pastebin of Configuration.txt: https://pastebin.com/duTGWLRW
• Server Host (if applicable): Apex Minecraft Hosting
• Pastebin of crashlogs or other relevant logs: [check code snippet above]
• Steps to Replicate: Use MySQL for a storage.

[ x ] I have looked at all other issues and this is not a duplicate
[ x ] I have been able to replicate this

Thanks for the clarification, I was here for that too.

@PlayingWithPi @patrix87 - ok to close?

Loading of the driver via that class is deprecated, but supported. The driver is not. We can make the change, but understand that there is zero functional consquence.