chore: release v0.2.6

[github-actions]

🤖 New release

• RustQuant: 0.2.5 -> 0.2.6 (✓ API compatible changes)

Changelog

0.2.6 - 2024-07-04

Other

• Merge pull request #221 from yfnaji/finite_difference_pricer_adjustments
• Amend function name from matrix_multiply_vector to general_matrix_multiply_vector
• Amend tridiagonal_matrix_multiply_vector() by removing match statement and manually add first and final entries outside loop
• Amend schemes to incorporate newly created tridiagonal_matrix_multiply_vector() and amendment in invert_tridiagonal_matrix()
• Introduce function exclusively for multiplication between tridiagonal matrix and vector + amend invert_tridiagonal_matrix() to return matrix representation using only diagonal and sub/super diagonals arguments
• Amend error threshold and target values for unit tests
• Remove now obsolete time_structure()
• Remove obsolete diagonal functions + amend condition functions
• Amend schemes to approximate transformed Black-Scholes equation
• Amend argument datatype from functions to f64 and amending create_tridiagonal_matrix() accordingly
• Adjustments in crank_nicolson()
• Adjustments in implicit()
• Adjustments in explicit()
• Refactor in create_tridiagonal_matrix()
• Correct error in implementation for call/put boundary conditions + remove unnecessary argument for boundary_condition_at_time_n()
• Remove unnecessary parameter from create_tridiagonal_matrix()

---

This PR was generated with release-plz.