sessioninfo 1.2.3

• session_info() no longer produces an error when info has length > 1
  (@nash-delcamp-slp, #96).

• Update pkgdown url to sessioninfo.r-lib.org.

• session_diff() now accepts the URL to a GitHub Actions log as the
  source for new and/or old (@jennybc, #68).

• session_info() output now includes an explanation for symbol
  highlighting packages attached to the search path (@IndrajeetPatil).

• session_info() and platform_info() now print the host name if the
  sessioninfo.include_hostname global option is set to TRUE
  (@certara-jcraig, #99).

• sessioninfo now does not leave behind detritus in the temporary
  directory.