Update to README (#248)

README.md

@@ -49,7 +49,7 @@ The following are the required runtime arguments that must be passed to the inst
 - `"total_token_supply"`: The total number of NFTs that a specific instance of a contract will mint passed in as a `U64` value. This parameter is required.
 - `"ownership_mode"`: The [`OwnershipMode`](/docs/modalities.md#ownership) modality that dictates the ownership behavior of the NFT contract. This argument is passed in as a `u8` value and is required at the time of installation.
 - `"nft_kind"`: The [`NFTKind`](/docs/modalities.md#nftkind) modality that specifies the off-chain items represented by the on-chain NFT data. This argument is passed in as a `u8` value and is required at the time of installation.
-- `"json_schema"`: The JSON schema for the NFT tokens that will be minted by the NFT contract passed in as a `String`. This parameter is required if the metadata kind is set to `CustomValidated(4)` and cannot be changed post installation.
+- `"json_schema"`: The JSON schema for the NFT tokens that will be minted by the NFT contract passed in as a `String`. This parameter is required if the metadata kind is set to `CustomValidated(3)` and cannot be changed post installation.
 - `"nft_metadata_kind"`: The base metadata schema for the NFTs to be minted by the NFT contract. This argument is passed in as a `u8` value and is required at the time of installation.
 - `"identifier_mode"`: The [`NFTIdentifierMode`](/docs/modalities.md#nftidentifiermode) modality dictates the primary identifier for NFTs minted by the contract. This argument is passed in as a `u8` value and is required at the time of installation.
 - `"metadata_mutability"`: The [`MetadataMutability`](/docs/modalities.md#metadata-mutability) modality dictates whether the metadata of minted NFTs can be updated. This argument is passed in as a `u8` value and is required at the time of installation.