Add optimism retro funding id

Author: cgewecke

funding.json

@@ -0,0 +1,10 @@
+{
+  "drips": {
+    "ethereum": {
+      "ownedBy": "0xaA4c632684180bf781108c84E7a294B483D12053"
+    }
+  },
+  "opRetro": {
+    "projectId": "0xc2d8139cd61ddc75689610ee0cca0fe37ba8bec3270beb6aac6eac91c6256f60"
+  }
+}