Genesis header author index is set to u16::max (#66)

Author: davxy

docs/knowledge/genesis-config.md

@@ -57,13 +57,13 @@ vectors - we define the following values for the genesis header.
     },
     "tickets_mark": null,
     "offenders_mark": [],
-    "author_index": 0,
+    "author_index": 0xffff,
     "entropy_source": "0x000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
     "seal": "0x000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
 }
 ```
 
-Expected hash: `0xe864d485113737c28c2fef3b2aed39cb2f289a369b15c54e9c44720bcfdc0ca0`
+Expected hash: `0x2531a16fa6717458a12d8252381223aad7cd9f9a75e07adb3a413b8320da62bf`
 
 Binary encoding must adhere to the Block serialization specification established in the Gray Paper.