installing readthedocs

    ERROR: Command errored out with exit status 1:
     command: /opt/readthedocs.org/venv/bin/python /opt/readthedocs.org/venv/lib/python3.8/site-packages/pep517/_in_process.py prepare_metadata_for_build_wheel /tmp/tmpmscda83d
         cwd: /tmp/pip-install-7rmhdg6g/orjson
    Complete output (44 lines):
    info: syncing channel updates for 'nightly-x86_64-unknown-linux-gnu'
    info: latest update on 2020-10-13, rust version 1.49.0-nightly (8dae8cdcc 2020-10-12)
    info: downloading component 'cargo'
    info: downloading component 'clippy'
    info: downloading component 'rust-docs'
    info: downloading component 'rust-std'
    info: downloading component 'rustc'
    info: downloading component 'rustfmt'
    info: installing component 'cargo'
    info: Defaulting to 500.0 MiB unpack ram
    info: installing component 'clippy'
    info: installing component 'rust-docs'
    info: installing component 'rust-std'
    info: installing component 'rustc'
    info: installing component 'rustfmt'
    💥 pyo3-pack failed
      Caused by: Cargo metadata failed: Error during execution of `cargo metadata`:     Updating crates.io index
        Updating git repository `https://github.com/PyO3/pyo3.git`
        Updating git repository `https://github.com/ijl/json.git`
    error: failed to get `serde_json` as a dependency of package `orjson v2.0.7 (/tmp/pip-install-7rmhdg6g/orjson)`
    
    Caused by:
      failed to load source for dependency `serde_json`
    
    Caused by:
      Unable to update https://github.com/ijl/json.git?rev=2c0c55b628c9177543283a1535549e1dcb6a870a
    
    Caused by:
      failed to clone into: /home/madmin/.cargo/git/db/json-240b451de80eb693
    
    Caused by:
      failed to authenticate when downloading repository
    
      * attempted to find username/password via git's `credential.helper` support, but failed
    
      if the git CLI succeeds then `net.git-fetch-with-cli` may help here
      https://doc.rust-lang.org/cargo/reference/config.html#netgit-fetch-with-cli
    
    Caused by:
      failed to acquire username/password from local configuration
    
    Checking for Rust toolchain....
    Running `pyo3-pack pep517 write-dist-info --metadata-directory /tmp/pip-modern-metadata-3wg24b5c --manylinux=off --rustc-extra-args=-C target-feature=+sse2 --strip=on`
    Error: Command '['pyo3-pack', 'pep517', 'write-dist-info', '--metadata-directory', '/tmp/pip-modern-metadata-3wg24b5c', '--manylinux=off', '--rustc-extra-args=-C target-feature=+sse2', '--strip=on']' returned non-zero exit status 1.
    ----------------------------------------
ERROR: Command errored out with exit status 1: /opt/readthedocs.org/venv/bin/python /opt/readthedocs.org/venv/lib/python3.8/site-packages/pep517/_in_process.py prepare_metadata_for_build_wheel /tmp/tmpmscda83d Check the logs for full command output.