Bump metalsmith to 2.5.0

[domoscargin]

[2.5.0] - 2022-06-10

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 2.4.x private method signature using the outdated unyield package.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

• Added Metalsmith#env method. Supports passing DEBUG and DEBUG_LOG amongst others. Sets CLI: true when run from the metalsmith CLI.
• Added Metalsmith#debug method for creating plugin debuggers
• Upgraded all generator-based methods (Metalsmith#read,Metalsmith#readFile,Metalsmith#write,Metalsmith#writeFile, Metalsmith#run and Metalsmith#process) to dual callback-/ promise-based methods
• Added org migration notification to postinstall script to encourage users to upgrade

Removed

• Dropped support for Node < 12
• Dependencies:
  • thunkify: replaced with promise-based implementation
  • unyield replaced with promise-based implementation
  • co-fs-extra: replaced with native Node.js methods
  • chalk: not necessary for the few colors used by Metalsmith CLI

Updated

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

Fixed

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

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[36degrees]

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