CIP-0034 | Update registry.json to reflect Preview and Pre-Production test networks (#332)

* Removed legacy testnet, added preview and pre-production

* Removed dash from Pre-Production name

Author: Ryun1

Diff for: CIP-0034/registry.json

@@ -1,14 +1,20 @@
 {
+    "PreProduction": {
+        "Name": "Pre-Production",
+        "NetworkId": 3,
+        "NetworkMagic": 1,
+        "GenesisHash": "d4b8de7a11d929a323373cbab6c1a9bdc931beffff11db111cf9d57356ee1937"
+    },
+    "Preview": {
+        "Name": "Preview",
+        "NetworkId": 2,
+        "NetworkMagic": 2,
+        "GenesisHash": "72593f260b66f26bef4fc50b38a8f24d3d3633ad2e854eaf73039eb9402706f1"
+    },
     "Mainnet": {
         "Name": "Mainnet",
         "NetworkId": 1,
         "NetworkMagic": 764824073,
         "GenesisHash": "5f20df933584822601f9e3f8c024eb5eb252fe8cefb24d1317dc3d432e940ebb"
-    },
-    "Testnet": {
-        "Name": "Testnet",
-        "NetworkId": 0,
-        "NetworkMagic": 1097911063,
-        "GenesisHash": "96fceff972c2c06bd3bb5243c39215333be6d56aaf4823073dca31afe5038471"
     }
 }