build: bump github.com/BurntSushi/toml from 0.3.1 to 0.4.0

[dependabot]

Bumps github.com/BurntSushi/toml from 0.3.1 to 0.4.0.

Release notes

Sourced from github.com/BurntSushi/toml's releases.

v0.4.0

After some time of inactivity this package is now maintained again.

This release should support alll of TOML 1.0 and has various bugfixes and a few small improvements.

This requires Go 1.13 or newer; older Go versions will no longer work.

TOML 1.0 support

Previously this library implemented TOML 0.3; now all of TOML 1.0 is supported:

• Support dotted keys (a.b = 1, a = {b.c = 2}).

• Mixed arrays: in previous TOML versions array values all had to be of the same type; you can now freely mix types, including inline tables.

• Support hex (0x2f9a), binary (0b0110), and octal (0o777) literals, and support nan and inf for floats.

• Support local datetimes, dates, and times. These are dates and times without a timezone and are parsed in the local timezone.

• Allow accidental whitespace between backslash and newline in the line continuation operator in multi-line basic strings.

There should be no incompatibilities as such; all existing valid TOML files should continue to work. However, the parser previously allowed the following invalid values:

• It would allow literal control characters in strings.

• It would allow leading zeroes in decimal ints and floats.

Neither of these was ever valid TOML, and are explicitly forbidden by the specification. But the library erroneously permitted them.

Other changes

• Set up Go modules.

• Allow escaping the \, and allow triple-quotes strings to end with a quote (e.g. x="""x"""").

• All control characters inside strings are properly escaped when encoding.

• Support encoding nested anonymous structs.

• Encode toml.Primitive values.

• You get a more helpful error on UTF-16 files (probably the most common non-UTF-8 compatible encoding). Also read over UTF-16 BOM in UTF-8 files.

• Call MarshalText and UnmarshalText consistently on all types; before this didn't always happen in some cases.

• Allow empty quoted keys ("" = 1); silly, but explicitly mentioned as valid.

• Don't panic in encoder on unsupported types; return an error instead.

• Don't panic on unclosed inline arrays.

... (truncated)

Commits

• 642b87a Move toml.LocalDatetime to internal package
• 5f40317 Update documentation
• 8162ef3 Update to latest toml-test
• ebe1404 Merge pull request #307 from BurntSushi/local-datetime
• fa10b4c Deal with local datetimes, dates, and times better
• ccff24e Merge pull request #306 from BurntSushi/array
• 7d6f80f Allow mixed values in arrays
• 01bfc69 Merge pull request #304 from BurntSushi/tag
• 765ab8d Move the tag/untag code for toml-test-{en,de}coder to internal/tag
• df5bf7f Merge pull request #303 from BurntSushi/ml-end
• Additional commits viewable in compare view

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