Fix json_query not sending token in request

[bytedream]

Description

This PR fixes the issue that the Client::json_query function doesn't send the Authorization HTTP header (#126)

Checklist

• Formatted code using cargo fmt --all
• Linted code using clippy
  • with reqwest feature: cargo clippy --manifest-path influxdb/Cargo.toml --all-targets --no-default-features --features use-serde,derive,reqwest-client -- -D warnings
  • with surf feature: cargo clippy --manifest-path influxdb/Cargo.toml --all-targets --no-default-features --features use-serde,derive,hyper-client -- -D warnings
• Updated README.md using cargo doc2readme -p influxdb --expand-macros
• Reviewed the diff. Did you leave any print statements or unnecessary comments?
• Any unfinished work that warrants a separate issue captured in an issue with a TODO code comment

[Empty2k12]

Thanks a lot!

Could you add a test which covers this case, so it never breaks again?

[bytedream]

Sure, I've added two tests testing if the auth is working correctly.

[msrd0]

LGTM, Thanks!

[Empty2k12]

Thanks a lot!