4.0.3

Release for Semigroups

What's Changed

• Update authors + mailmap by @james-d-mitchell in #837
• Resolve issue #835 (implement MultiplicationTable for fp semigroups and monoids) by @james-d-mitchell in #838
• Improve ccache hit rate in CI by @james-d-mitchell in #840
• Improve support for quotient semigroups by @james-d-mitchell in #841
• semigrp: remove 2 unnec. methods after #841 by @james-d-mitchell in #843
• congsemigraph: add meet method by @james-d-mitchell in #842
• Remove superfluous strings from error messages by @james-d-mitchell in #845
• Update version numbers etc for 4.0.3 by @james-d-mitchell in #846

Full Changelog: v4.0.2...v4.0.3