Release v0.9.0

- PyVista as preferred 3D backend with mayavi legacy fallback
- Non-orthogonal cell support via _build_structured_grid
- Fix scipy.integrate.simps compatibility with scipy 1.14+
- Remove Python 2.7 / Canopy references

Co-Authored-By: deepseek-v4-pro

Author: zhengjiang shao

README.rst

@@ -156,6 +156,7 @@ Important update log
 .. csv-table::
     :header: "Date", "Version", "Description"
 
+    "2026-05-15", "0.9.0", "PyVista 3D backend, non-orthogonal cell support, scipy 1.14+ fix"
     "2016-08-08", "0.7.0", "Enhance universality"
     "2016-07-15", "0.6.0", "Compatible with python 3"
     "2015-08-04", "0.1.0", "Initial version"

vaspy/__init__.py

@@ -8,7 +8,7 @@
     PY2 = True
 
 
-__version__ = '0.8.12'
+__version__ = '0.9.0'
 __all__ = ['atomco', 'electro', 'iter', 'matstudio', 'plotter', 'incar']