Fix discord badge in readme

[marijnvdwerf]

The discord badge in the readme wasn't a link, causing GitHub to just open the original image on click. I wrapped it in the same link that was in the badge url https://discord.gg/2ms58QJjqp

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Latest commit: 4fb86ad

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[Crunchyman-ralph]

you're a legend!

[eyaltoledano]

Hate to do this friends but I just boosted the server and got us a permanent URL, we ought to use that.

https://discord.gg/taskmasterai

@marijnvdwerf @Crunchyman-ralph feel free to make an amended PR