added testnet 47 config for previous spork testing

Author: gomisha

testnet.json

@@ -20,6 +20,15 @@
     "port": 8080,
     "spork_seal_tolerance": 600,
     "sporks": {
+        "47": {
+            "access_nodes": [
+                {
+                    "address": "access-001.devnet47.nodes.onflow.org:9000"
+                }
+            ],
+            "root_block": 113167876,
+            "version": 5
+        },
         "48": {
             "access_nodes": [
                 {