Update dependency metalsmith to ^2.5.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
metalsmith (source)	^2.4.3 -> ^2.5.0

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Release Notes

metalsmith/metalsmith

v2.5.0

Compare Source

Important note to metalsmith-watch users:
Although 2.5.0 is a semver-minor release, it breaks compatibility with metalsmith-watch, which relies on the Metalsmith < 2.4.x private method signature using the outdated unyield package. See issue #​374 for more details.

Added

• #​354 Added Metalsmith#env method. Supports passing DEBUG and DEBUG_LOG amongst others. Sets CLI: true when run from the metalsmith CLI. b42df8c, 446c676, 33d936b, 4c483a3
• #​356 Added Metalsmith#debug method for creating plugin debuggers
• #​362 Upgraded all generator-based methods (Metalsmith#read,Metalsmith#readFile,Metalsmith#write,Metalsmith#writeFile, Metalsmith#run and Metalsmith#process) to dual callback-/ promise-based methods 16a91c5, faf6ab6, 6cb6229
• Added org migration notification to postinstall script to encourage users to upgrade 3a11a24

Removed

• [#​231] Dropped support for Node < 12 0a53007
• Dependencies:
  • thunkify: replaced with promise-based implementation faf6ab6
  • unyield replaced with promise-based implementation faf6ab6
  • co-fs-extra: replaced with native Node.js methods faf6ab6
  • chalk: not necessary for the few colors used by Metalsmith CLI 1dae1cb
  • clone: see #​247 a871af6

Updated

• Restructured and updated README.md 0da0c4d
• #​247 Calling Metalsmith#metadata no longer clones the object passed to it, overwriting the previous metadata, but merges it into existing metadata.

Fixed

• #​355 Proper path resolution for edge-cases using CLI, running metalsmith from outside or subfolder of metalsmith.directory()5d75539

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