remove duplicate uri map

Author: Krishang Nadgauda

contracts/drop/SignatureDrop.sol

@@ -103,9 +103,6 @@ contract SignatureDrop is
                                 Mappings
     //////////////////////////////////////////////////////////////*/
 
-    /// @dev Mapping from tokenId => URI (for tokens minted with signature)
-    mapping(uint256 => string) private uri;
-
     /// @dev Mapping from claimer => condition Id => timestamp of last claim.
     mapping(address => mapping(bytes32 => uint256)) private lastClaimTimestamp;
 
@@ -196,12 +193,8 @@ contract SignatureDrop is
     //////////////////////////////////////////////////////////////*/
 
     /// @dev Returns the URI for a given tokenId.
-    function tokenURI(uint256 _tokenId) public view override returns (string memory uriForToken) {
-        uriForToken = uri[_tokenId];
-
-        if (bytes(uriForToken).length == 0) {
-            uriForToken = string(abi.encodePacked(getBaseURI(_tokenId), _tokenId.toString()));
-        }
+    function tokenURI(uint256 _tokenId) public view override returns (string memory) {
+        return string(abi.encodePacked(getBaseURI(_tokenId), _tokenId.toString()));
     }
 
     /// @dev See ERC 165

docs/SignatureDrop.md

@@ -937,7 +937,7 @@ function thirdwebFee() external view returns (contract ITWFee)
 ### tokenURI
 
 ```solidity
-function tokenURI(uint256 _tokenId) external view returns (string uriForToken)
+function tokenURI(uint256 _tokenId) external view returns (string)
 ```
 
 
@@ -954,7 +954,7 @@ function tokenURI(uint256 _tokenId) external view returns (string uriForToken)
 
 | Name | Type | Description |
 |---|---|---|
-| uriForToken | string | undefined
+| _0 | string | undefined
 
 ### totalSupply