Bump toml from 0.5.8 to 0.5.9

[dependabot[bot]]

Bumps toml from 0.5.8 to 0.5.9.

Release notes

Sourced from toml's releases.

0.5.9

Changes:

• #373: Allow empty table keys
• #426: Fix serialization of -0.0
• #439: Make datetime structs and fields public

Commits

• 70caf40 Merge pull request #463 from ehuss/version-bump
• 63dd7f7 Bump to 0.5.9
• 499e8c4 examples: Allow dead code (#450)
• 83d787c Make datetime.rs structs and fields public #431 (#439)
• d8a9a98 Use entry api to remove a lookup in deserialisation loop (#438)
• c2a069f Upgrade to GitHub-native Dependabot (#427)
• a6420b6 Merge pull request #373 from mgsloan/allow-empty-table-keys
• 1928707 Fix serialization of -0.0. (#426)
• b141700 Merge pull request #417 from hone/patch-1
• a6e3d52 Fix comment typo
• Additional commits viewable in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot squash and merge will squash and merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge and block automerging
• @dependabot reopen will reopen this PR if it is closed
• @dependabot close will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
• @dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)