chore(lint): fix unused-parameter error

[abemedia]

No description provided.

[github-actions]

Benchmark Results

.

goos: linux
goarch: amd64
pkg: github.com/abemedia/go-don
cpu: AMD EPYC 7763 64-Core Processor                
                         │   before    │               after                │
                         │   sec/op    │   sec/op     vs base               │
Handler/Request-4          252.8n ± 1%   252.0n ± 3%       ~ (p=0.403 n=10)
Handler/RequestPointer-4   274.4n ± 0%   274.4n ± 1%       ~ (p=0.697 n=10)
geomean                    263.4n        263.0n       -0.17%

                         │   before   │                after                │
                         │    B/op    │    B/op     vs base                 │
Handler/Request-4          24.00 ± 0%   24.00 ± 0%       ~ (p=1.000 n=10) ¹
Handler/RequestPointer-4   24.00 ± 0%   24.00 ± 0%       ~ (p=1.000 n=10) ¹
geomean                    24.00        24.00       +0.00%
¹ all samples are equal

                         │   before   │                after                │
                         │ allocs/op  │ allocs/op   vs base                 │
Handler/Request-4          1.000 ± 0%   1.000 ± 0%       ~ (p=1.000 n=10) ¹
Handler/RequestPointer-4   1.000 ± 0%   1.000 ± 0%       ~ (p=1.000 n=10) ¹
geomean                    1.000        1.000       +0.00%
¹ all samples are equal