- update to version 2.7.3:
* Bug fix; incorrect free of compiled pattern.
* Unexpected network errors and IMAP BYE are now logged.
- changes from version 2.7.2:
* Makefile is back to being Lua version agnostic.
- changes from version 2.7.1:
* Makefile now builds with Lua 5.4 and PCRE2.
- changes from version 2.7 :
* Lua 5.4 compatibility (the codebase can still be compiled with
versions 5.3, 5.2 and 5.1).
* PCRE2 compatibility (version 10.00 and later)
* New error code is returned if certificate verify fails.
* Bug fix; add missing truststore option from brief usage message.