Release 6.0.0

6.0.0

• Update README.md to include examples of git revisions (#1802)—thanks @brannondorsey
• Remove if_chain crate (6e73a33)—thanks @brannondorsey
• Remove unnecessary parenthesis in error.rs (30657a9)
• Fix nightly build (b861ff9)
• Bump MSRV to 1.91 (dda53fc)
• Update README.md toml example (c3225dc)
• BREAKING: Remove MSRV policy (#1967)
• Updated dependencies
  • cargo_metadata upgraded to version 0.23
  • cargo-util-schemas upgraded to version 0.13
  • ctor upgraded to version 1.0
  • home upgraded to version 0.5
  • libloading upgraded to version 0.9
  • similar-asserts upgraded to version 2.0
  • toml_edit upgraded to version 0.25
  • toml upgraded to version 1.1
• Removed dependencies
  • if_chain removed
  • rustversion removed