Update ultraviolet requirement from ^0.6.0 to ^0.8.1

[dependabot[bot]]

Updates the requirements on ultraviolet to permit the latest version.

Changelog

Sourced from ultraviolet's changelog.

0.8.1

• Implement Serialize and Deserialize for all UVec,IVec, DVec, DMat types (under serde, int and f64 feature flags)
• Implement conversions between integer and float vectors.
• Add #[must_use] attributes on .normalized methods to help prevent silent logic bugs when .normalize() would have been more appropriate.
• Build docs.rs docs with all features.

0.8.0

• Update wide to 0.6.x
• Add Rotor3::into_angle_plane()
• Add Rotor3::into_quaternion_array and Rotor3::from_quaternion_array
• Implement Serialize and Deserialize for Isometry2 and Isometry3 (under serde feature flag)
• Added const to new functions for integer vectors.
• Add Mat4::truncate()
• Add Mul<Scalar> and Add<Self> for isometries and similarities

0.7.5

• Add Mat4::extract_translation, Mat4::extract_rotation and Mat4::into_isometry.
• Add missing PartialEq implementations for all matrices, transformations, vectors, bivectors and rotors, including SIMD and f64 variants
• Fix Rotor2::rotate_vec and corresponding derivation.

0.7.4

• Add optional bytemuck support

0.7.3

• Fix integer types not compiling properly.

0.7.2

• Implement Serialize and Deserialize for bivectors and rotors (under serde feature flag)

0.7.1

• Fix typo in Mat3::inverse implementation which made it transpose instead

0.7.0

• Add Mat3 into Rotor3 conversion for rotation matrices
• Remove heavy reliance on mul_add due to negligible performance benefit and in many cases performance detriment.
• Slightly optimize Vector normalize.
• Rotor2::from_angle_plane() now takes plane and angle as separate arguments.
• Add MatN::adjugate().
• Mat3::from_nonuniform_scale_homogeneous() now takes a Vec2 instead of a Vec3.

... (truncated)

Commits

• 2809097 (cargo-release) version 0.8.1
• e5bc083 build docs.rs docs with all features
• d2ac806 must_use for normalized
• b8704fe impl TryFrom between vector types (#104) (#126)
• baa9273 Make clippy happy (#125)
• eb26126 Impl Serde for DVec and DMat using macros (#124)
• 91dd45f Improve matrix rotations (#123)
• 90c3092 Better document undefined behavior in Rotor::from_rotation_between() (#121)
• a01b304 Fix some warnings for clippy (#120)
• cbedda7 (cargo-release) start next development iteration 0.8.1-alpha.0
• Additional commits viewable in compare view

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Superseded by #64.