Release v1.2.1

Since Last Release:
* 5006282 (HEAD, tag: v1.2.1, origin/master) Update Release notes to show Body [bundabrg]
| * Release will publish the body of the commit to both Github Release and SpigotMC
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* ba52720 Handle duplicate Portal Addresses [bundabrg]
| Changes:
| * Trying to place a second portal with same network+address will pop out the address block
| * We also now show when a portal is valid or not by changing its block to a BEACON when valid
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* 8e09c15 Merge pull request #17 from bundabrg/feature/spigot-update [bundabrg]
|\ Feature/spigot update
| * 837f1f3 Update Build Workflow [bundabrg]
| |
| * 0b8c81d Update README [bundabrg]
|/
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* 5f83bfa Merge pull request #16 from bundabrg/feature/spigot-update [bundabrg]
| Feature/spigot update
* 9daac9c Update Shading Pattern [bundabrg]