bug: when get problem, return 403 error

[ben1009]

when run cargo r xx_id
return 
getting all problems ...
[src/fetcher.rs:118:5] &res = Response {
    url: "https://leetcode.com/api/problems/algorithms",
    status: 403,

thread 'main' panicked at src/fetcher.rs:119:16:
called `Result::unwrap()` on an `Err` value: Error(Json(Error("expected value", line: 1, column: 1)))
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

refer to: skygragon/leetcode-cli#194 (comment)