Merge #149

149: Bump toml from 0.5.3 to 0.5.4 r=pitkley a=dependabot-preview[bot]

Bumps [toml](https://github.com/alexcrichton/toml-rs) from 0.5.3 to 0.5.4.
<details>
<summary>Commits</summary>

- [`189d2b9`](toml-rs/toml-rs@189d2b9) Bump to 0.5.4
- [`c049b7a`](toml-rs/toml-rs@c049b7a) Decrease deserialization complexity from quadratic to linear ([#349](https://github-redirect.dependabot.com/alexcrichton/toml-rs/issues/349))
- [`ec21d60`](toml-rs/toml-rs@ec21d60) Support for dotted table spans ([#340](https://github-redirect.dependabot.com/alexcrichton/toml-rs/issues/340))
- [`e9f5290`](toml-rs/toml-rs@e9f5290) Switch from linked-hash-map to indexmap
- [`8995cef`](toml-rs/toml-rs@8995cef) Spanned: impl PartialEq, Eq, Hash, PartialOrd, Ord in terms of the value ([#344](https://github-redirect.dependabot.com/alexcrichton/toml-rs/issues/344))
- [`9ed2903`](toml-rs/toml-rs@9ed2903) Remove outdated Travis CI badge ([#346](https://github-redirect.dependabot.com/alexcrichton/toml-rs/issues/346))
- [`2a6729f`](toml-rs/toml-rs@2a6729f) feat: support tabs in basic strings ([#343](https://github-redirect.dependabot.com/alexcrichton/toml-rs/issues/343))
- [`e457e4e`](toml-rs/toml-rs@e457e4e) get_mut should return a mutable reference ([#338](https://github-redirect.dependabot.com/alexcrichton/toml-rs/issues/338))
- [`41dd8e6`](toml-rs/toml-rs@41dd8e6) Forbid unsafe code ([#332](https://github-redirect.dependabot.com/alexcrichton/toml-rs/issues/332))
- [`7c9b0a3`](toml-rs/toml-rs@7c9b0a3) Support deserializing spanned keys ([#333](https://github-redirect.dependabot.com/alexcrichton/toml-rs/issues/333))
- Additional commits viewable in [compare view](toml-rs/toml-rs@0.5.3...0.5.4)
</details>
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