Update ox requirement from ~> 2.5.0 to >= 2.5, < 2.12

[dependabot-preview]

Updates the requirements on ox to permit the latest version.

Changelog

Sourced from ox's changelog.

[2.11.0] - 2019-06-14

Changed

• Ox::SyntaxError replaces SyntaxError where such an exception would have previously been raised.

Fixed

• File offsets when using the SAX parser now use off_t. Setting
  -D_FILE_OFFSET_BITS=64 in the Makefile may allow 32 bit systems to access
  files larger than 2^32 in size. This has not been tested.

[2.10.1] - 2019-05-27

Fixed

• Remove extra space from doctype dump.

[2.10.0] - 2018-08-26

Fixed

• :element_key_mod and :attr_key_mod options were added to allow keys to be modified when loading.

[2.9.4] - 2018-07-16

Fixed

• Fixed issue with malformed object mode input.

[2.9.3] - 2018-06-12

Fixed

• Handle \0 in dumped strings better.
• No \n added on dumped if indent is less than zero.

[2.9.2] - 2018-04-16

Fixed

• locate fixed to cover a missing condition with named child thanks to mberlanda.

Added

• locate supports attribute exists searches thanks to mberlanda.

[2.9.1] - 2018-04-14

Fixed

• prepend_child added by mberlanda.

[2.9.0] - 2018-03-13

Added

• New builder methods for building HTML.
• Examples added.

... (truncated)

Commits

• 1f2b08b Fix spelling mistake in Changelog
• 3592756 Change SAX parser to use off_t instead of int
• 6330cc4 Change SAX parser to use off_t instead of int
• e5f9138 Create FUNDING.yml
• b12598f Introduce an Ox::SyntaxError class (#233)
• 2e6f7a5 travis update
• f0b3049 Remove extra space dumping doctype
• f5b6182 Refactor to change reserved identifiers
• 34179ca Implement remove_children (#222)
• 1262ded Update travis versions
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #35.