v0.3.4

PoincareInvariants v0.3.4

Diff since v0.3.3

Merged pull requests:

• CompatHelper: bump compat for GeometricIntegrators to 0.9, (keep existing compat) (#18) (@github-actions[bot])
• Change OrthogonalPolynomialsQuasi implementation to ClassicalOrthogonalPolynomials (#19) (@michakraus)