add plasma in networks list

Author: khadni

public/changelog.json

@@ -212,6 +212,10 @@
       "displayName": "OP",
       "iconUrl": "https://docs.chain.link/assets/chains/optimism.svg"
     },
+    "plasma": {
+      "displayName": "Plasma",
+      "iconUrl": "https://docs.chain.link/assets/chains/plasma.svg"
+    },
     "plume": {
       "displayName": "Plume",
       "iconUrl": "https://docs.chain.link/assets/chains/plume.svg"