What's changed

• The modfile, module, semver and txtar packages are all now deprecated and forward what they can to to their respective upstream packages.
• Helper commands can now write to stdout and stderr (see #216; Thanks @myitcv).
• A source of "unexpected command failure" errors on MacOS has been fixed. (See #222; Thanks to @bep)
• Misspelled commands make suggestions for the correct spelling. (See #198; Thanks to @Merovius)
• The lockedfile and cache packages have been updated to Go tip (Thanks to @mvdan)
• The README file updated with some useful context (See #224; Thanks to @thepudds).