update timestamp of first blocks to match Host timestamp (#48)

* update timestamp of block zero

* lowercase

Author: anna-carroll

crates/genesis/src/mainnet.genesis.json

@@ -66,7 +66,7 @@
     "depositContractAddress": null
   },
   "nonce": "0x0",
-  "timestamp": "0x0",
+  "timestamp": "0x690b792f",
   "extraData": "0x",
   "gasLimit": "0x1c9c380",
   "difficulty": "0x0",

crates/genesis/src/pecorino.genesis.json

@@ -66,7 +66,7 @@
     "depositContractAddress": null
   },
   "nonce": "0x0",
-  "timestamp": "0x0",
+  "timestamp": "0x6894e6bd",
   "extraData": "0x",
   "gasLimit": "0x1c9c380",
   "difficulty": "0x0",