update changelog

Author: MuellerSeb

CHANGELOG.md

@@ -2,6 +2,24 @@
 
 All notable changes to **AnaFlow** will be documented in this file.
 
+## [1.2.0] - 2025-05
+
+See [#12](https://github.com/GeoStat-Framework/AnaFlow/pull/12)
+
+### Enhancements
+- added solutions based on the effective transmissivity for the ["Integral" variogram model](https://geostat-framework.readthedocs.io/projects/gstools/en/v1.7.0/api/gstools.covmodel.Integral.html):
+  - `ext_thiem_int`: steady state solution
+  - `ext_thiem_int_3d`: steady state solution incorporating vertical anisotropy
+  - `ext_theis_int`: transient solution
+  - `ext_theis_int_3d`: transient solution incorporating vertical anisotropy
+- added `fix_T_well` and `fix_K_well` bool flag to transient heterogeneous solutions to be able to set if the well value for the effective transmissivity/conductivity should be determined from the limit (`True`) or from the upscaled value in the first ring segment (`False`, default)
+  - **breaking**: the previous behavior was effectively this set to `True`, which for steep effective curves resulted in an increasing error in the effective head near the well
+
+### Changes
+- updated docs (use myst parser for markdown files, only generate html and pdf)
+- updated CI (fixed artifacts up-/download action, see #14)
+- use hatchling as build backend
+
 
 ## [1.1.0] - 2023-04
 
@@ -88,6 +106,7 @@ Containing:
 - lap_transgwflow_cyl - Solution for a diskmodel in laplace inversion
 
 
+[1.2.0]: https://github.com/GeoStat-Framework/AnaFlow/compare/v1.1.0...v1.2.0
 [1.1.0]: https://github.com/GeoStat-Framework/AnaFlow/compare/v1.0.1...v1.1.0
 [1.0.1]: https://github.com/GeoStat-Framework/AnaFlow/compare/v1.0.0...v1.0.1
 [1.0.0]: https://github.com/GeoStat-Framework/AnaFlow/compare/v0.4.0...v1.0.0