3.4.0

This is a minor release with the following new features added to the package:

• CanonicalReesMatrixSemigroup and CanonicalReesZeroMatrixSemigroup written by Chris Russell.
• ParseRelations for finitely presented semigroups or monoids written by Luke Elliott.
• TikzString method was implemented for collections of PBRs by Finn Smith.

The following bugs/issues were resolved:

• Issue #685: after some somewhat recent changes in libsemigroups some infinite finitely presented semigroups in GAP reported their size as being -2. Fixed by James D. Mitchell.
• Issue #680: Semigroups did not compile with recent git versions of libsemigroups. Reported by Wilf A. Wilson fixed by James D. Mitchell.

The required minimum version of libsemigroups is now v1.1.0.