Bump lunr from 0.7.0 to 2.3.9

[dependabot]

Bumps lunr from 0.7.0 to 2.3.9.

Changelog

Sourced from lunr's changelog.

2.3.9

• Fix bug #469 where a union with a complete set returned a non-complete set. Thanks Bertrand Le Roy for reporting and fixing.

2.3.8

• Fix bug #422 where a pipline function that returned null was not skipping the token as described in the documentation. Thanks Stephen Cleary and Rob Hoelz for reporting and investigating.

2.3.7

• Fix bug #417 where leading white space would cause token position metadata to be reported incorrectly. Thanks Rob Hoelz for the fix.

2.3.6

• Fix bug #390 with fuzzy matching that meant deletions at the end of a word would not match. Thanks Luca Ongaro for reporting.

2.3.5

• Fix bug #375 with fuzzy matching that meant insertions at the end of a word would not match. Thanks Luca Ongaro for reporting and to Rob Hoelz for providing a fix.
• Switch to using Array.isArray when checking for results from pipeline functions to support vm.runInContext, #381 thanks Rob Hoelz.

2.3.4

• Ensure that inverted index is prototype-less after serialization, thanks Rob Hoelz.

2.3.3

• Fig bugs #270 and #368, some wildcard searches over long tokens could be extremely slow, potentially pinning the current thread indefinitely. Thanks Kyle Spearrin and Mohamed Eltuhamy for reporting.

2.3.2

• Fix bug #369 in parsing queries that include either a boost or edit distance modifier followed by a presence modifier on a subsequent term. Thanks mtdjr for reporting.

2.3.1

• Add workaround for inconsistent browser behaviour #279, thanks Luca Ongaro.
• Fix bug in intersect/union of lunr.Set #360, thanks Brandon Bethke for reporting.

2.3.0

• Add support for build time field and document boosts.
• Add support for indexing nested document fields using field extractors.
• Prevent usage of problematic characters in field names, thanks Stephane Mankowski.
• Fix bug when using an array of tokens in a single query term, thanks Michael Manukyan.

2.2.1

• Fix bug #344 in logic for required terms in multiple fields, thanks Stephane Mankowski.
• Upgrade mocha and fix some test snafus.

... (truncated)

Commits

• aa5a878 Build version 2.3.9
• fcfc7a8 Fix unused variable lint
• 901ff84 change travis badge to svg
• ee4a8f9 Complete set union is complete
• 9ede3d3 Use HTTPS for the GitHub bugs link
• 3ba723b Fix typo in README.md
• b6bc238 README grammar fix
• 9e851a9 Fix 2.3.5 not being a header in CHANGELOG.md
• fe1c03e Build version 2.3.8
• 8e119ec Skip tokens when pipeline function returns null
• Additional commits viewable in compare view

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[deivid-rodriguez]

Marking as WIP because this seems to break our search middleman plugin.

[deivid-rodriguez]

I guess it needs manastech/middleman-search#29. We should consider alternatives like forking this gem for now, using a different search plugin, or whatever.