Log Message:
asdf: update to 0.16.1. Changes:

- Rewrite asdf in Golang
  The rewrite in Go was spread across 88 pull requests that are all
  included in this release. The primary goal of the rewrite was to
  create a codebase that was faster, simpler and easier to maintain. The
  rewrite tries to maintain feature parity with the previous version.
  However, a number of breaking changes were introduced. Some of these
  were due to the change of language, a few out of a desire to simplify
  the code, and some to improve the user experience. For the full list
  of breaking changes and the upgrade guide visit the Upgrading to
  0.16.0 page on the asdf website. It is highly recommended that you
  read this guide before upgrading.
- correct SliceToMap environment variable parsing function
- remove old hyphenated command from help
- replace reference to removed subcommands
- revert change to old Bash help text
- use version in home dir when no version found in root dir

See <https://asdf-vm.com/guide/upgrading-to-v0-16.html#breaking-changes>.