Release v1.4.0

• New commands:
  • :rfc: show all Rust RFC list.
• Improvements:
  • Error code search supports offline mode.
  • Expand the :stable command result to 100 versions.

What a coincidence! Rust will release v1.87.0 on its 10th anniversary day!

• Bugfix:
  • Fix docs.rs TOC overlap issue.
  • Fix weeks, hours, and dates statistics bug.
  • Fix percent statistics NAN bug. fix #125.
  • Fix % books search some invalid urls bug.

https://rust.extension.sh/changelog/