Merge pull request #289 from input-output-hk/fix-network-id-in-stake-delta-prefined

fix: Rename `Main` to `Mainnet` in `stake_delta_filter`

Author: lowhung

modules/stake_delta_filter/src/predefined.rs

@@ -1,5 +1,5 @@
 pub const POINTER_CACHE: [(&str, &str); 1] = [(
-    "Main",
+    "Mainnet",
     r#"
 {
   "pointer_map": [
@@ -58,7 +58,7 @@ pub const POINTER_CACHE: [(&str, &str); 1] = [(
         "cert_index": 0
       },
       {
-        "network": "Main",
+        "network": "Mainnet",
         "payload": {
           "StakeKeyHash": "bc1597ad71c55d2d009a9274b3831ded155118dd769f5376decc1369"
         }
@@ -79,7 +79,7 @@ pub const POINTER_CACHE: [(&str, &str); 1] = [(
         "cert_index": 0
       },
       {
-        "network": "Main",
+        "network": "Mainnet",
         "payload": {
           "StakeKeyHash": "e46c33afa9ca60cfeb3b7452a415c271772020b3f57ac90c496a6127"
         }
@@ -116,7 +116,7 @@ pub const POINTER_CACHE: [(&str, &str); 1] = [(
         "cert_index": 0
       },
       {
-        "network": "Main",
+        "network": "Mainnet",
         "payload": {
           "StakeKeyHash": "1332d859dd71f5b1089052a049690d81f7367eac9fafaef80b4da395"
         }