v0.5.5

MultivariatePolynomials v0.5.5

Diff since v0.5.4

Merged pull requests:

• Add substitution test failing for DynamicPolynomials (#274) (@blegat)
• Update to Documenter v1 (#275) (@blegat)
• Fix degree_complex (#292) (@projekter)
• Move gcd tests to separate file (#295) (@blegat)
• Promote integer to rational for division (#296) (@blegat)
• Fix constructors in order docstrings (#297) (@blegat)
• Improve docs for division (#299) (@blegat)