Merge #1749

1749: Bump config from 0.9.3 to 0.10.1 r=mergify[bot] a=dependabot-preview[bot]

Bumps [config](https://github.com/mehcode/config-rs) from 0.9.3 to 0.10.1.
<details>
<summary>Changelog</summary>

*Sourced from [config's changelog](https://github.com/mehcode/config-rs/blob/master/CHANGELOG.md).*

> ## 0.10.1 - 2019-12-07
>  - Allow enums as configuration keys [#119](https://github-redirect.dependabot.com/mehcode/config-rs/issues/119)
> 
> [#119](https://github-redirect.dependabot.com/mehcode/config-rs/issues/119): [rust-cli/config-rs#119](https://github-redirect.dependabot.com/mehcode/config-rs/pull/119)
> 
> ## 0.10.0 - 2019-12-07
>  - Remove lowercasing of keys (unless the key is coming from an environment variable).
>  - Update nom to 5.x
</details>
<details>
<summary>Commits</summary>

- See full diff in [compare view](https://github.com/mehcode/config-rs/commits)
</details>
<br />

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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: bors[bot]

Cargo.lock

@@ -15,7 +15,7 @@ bitcoin = { version = "0.19.1", features = ["use-serde"] }
 blockchain_contracts = "0.1"
 byteorder = "1.3"
 chrono = { version = "0.4", features = ["serde"] }
-config = { version = "0.9", features = ["toml"] }
+config = { version = "0.10", features = ["toml"] }
 debug_stub_derive = "0.3"
 derivative = "1"
 derive_more = "0.99.2"