chore: add plc.tartarus.us instance

authored by Benjamin Becker and committed by Tangled 8a395565 69a21082

Changed files
+4 -1
src
+4 -1
src/instances.json
··· 15 15 }, 16 16 { 17 17 "url": "https://plc.madebydanny.uk" 18 + }, 19 + { 20 + "url": "https://plc.tartarus.us" 18 21 } 19 - ] 22 + ]