- Replace original June 1991 GPLv2 with February 1999 (post-LGPLv2.1) GPLv2
- Replace contributor covenant v2.0 with v2.1
- adopt: Don't refuse existing cert created with --reuse-key (spotted by github/ran-deh)
- new/dup: Handle incorrectly quoted domains (spotted by github/ran-deh)
- Add support for overriding certbot command (spotted by github/ran-deh)
- Smarter certbot plugin/command defaults
- Detect incorrectly quoted certbot options
- Replace "$@" with "$*" where it matters (for Ubuntu/NetBSD) (spotted by github/ran-deh)
- Use /usr/xpg4/bin/sh if present (/bin/sh on Solaris11 is ksh93)
- Remove non-standard 'local' keyword for variables in functions
- make uninstall: Don't complain if files not installed
- make install: Silence Solaris tweak and improve its error reporting
- Rearrange copyright notice header
- doc: Add "/etc/letsencrypt" to "replacing live with current" for clarity
- doc: Replace "keypair" with "key" to avoid confusion with pairs of lineages
- Minor documentation improvements
- Remove superfluous echoes
- Fix variable name clash
- Support multiple base domains in a certificate lineage
- smimea: Add a better check that the certificate can do S/MIME encryption
- Add -1, --oneline option to output OPENPGPKEY/SMIMEA records on a single line
- openpgpkey-check: Fix output (add terminating dot) when no key but record exists
- Add command aliases: alias cb add tlsa del delete show
- Add -s, --spaces option to include spaces in --oneline output
