This update for zk fixes the following issues:

- Update to version 0.15.6:
  * Parse links to notes in frontmatter 
  * Set filters for lsp completion items from the config
  * Set a note's modification time in frontmatter and allow for custom key 
    naming for both creation and modification keys
  * Indexing made significantly more performant
  * Support filtering by date and time with "<date> <time>" instead of 
    <date>T<time> only
  * Exclude globs now prune matching directories from indexing, improving
    speed of indexing

- Update to version 0.15.5:
  * List, edit and filter for broken links with --broken-links
  * Update strftime package, supporting %g and %G formats in the 
    {{format-date}} helper
  * Option to append links to selected text, instead of replacing
  * Paths with ~ and env variables no longer error when passed to
    --notebook-dir and --working-dir
  * Guard LSP against unnecessary erroring on missing textDocument/definition
    capabilities

- Update to version 0.15.4:
  * fix "jump to definition" follows wrong link
  * zk config --list <object> (by @andrebauer, 484)
  * Ignore commented links for LSP diagnostics. Use an AST to parse files, fixing
  * other similar edge cases.
  * Links in markdown footnotes now included in :ZkLinks
  * Indexing notebook now 35% and 74% faster for full and incremental indexing
  * respectively
  * Stop crashing lsp server when server received textDocument/completion request with out of range parameters.
  * lsp: Provide completion after [[ on lines with multi-byte characters
  * Prevent crash in LookForward when the parameters is out of characters number.