It also uses `max_stable_version` in the json downloaded from https://crates.io/api/v1/crates/$name if possible, which is equivalent to the version shown on https://crates.io/crates/$name .
- Add new feat `json` to `binstalk-downloader`
- Impl new async fn `Response::json`
- use `Response::json` in `GhApiClient` impl
- Mark all err types in binstalk-downloader as `non_exhaustive`
- Ret `remote::Error` in `remote::Certificate::{from_pem, from_der}` instead of `ReqwestError`.
- Refactor `BinstallError`: Merge variant `Unzip`, `Reqwest` & `Http`
into one variant `Download`.
- Manually download and parse json from httos://crates.io/api/v1
- Remove unused deps `crates_io_api`
Signed-off-by: Jiahao XU <Jiahao_XU@outlook.com>
