V4 (#1111)

* Mixed subtree processing (#981)
* Refactor tests for test_mixed.py (#1027)
* Remove deprecated modules and functions/classes & warnings (#1026, #1032)
* Use readonly morphio Morphology by default (#979)
* Morphology level radial distance features use the soma as reference point (#1030)
* Expose subtree processing from the morph_stats api (#1034)
* Remove pyXX prefix for lint, docs, and coverage (#1038)
* Fix tutorials and add tutorial testenv (#1039)
* Add isort for formatting/linting (#1040)
* Add testing of example scripts (#1041)
* Make documentation/docstrings testable (#1035)
* Add black to neurom, format everything, and add to lint (#1042)
* Fix load_morpholgies to always resolve paths (#1047)
* allow Morphology objects to be either mut or immut (#1049)
* Replace iter_* methods by properties in core objects and improve iter_segments (#1054)
* Decouple Morphology constructor from io (#1120)
* Move soma methods to functions (#1118)

CHANGELOG.rst

@@ -1,6 +1,24 @@
 Changelog
 =========
 
+Version 4.0.0
+-------------
+
+- Morphology class accepts only morphio objects, not files anymore. (#1120)
+- Replace ``iter_*`` methods by properties in core objects and improve ``iter_segments``. (#1054)
+- NeuriteType extended to allow mixed type declarations as tuple of ints. (#1071)
+- All features return built-in types (#1064)
+- Morphology class also allows mutable morphio objects to be passed explicitly. (#1049)
+- Morphology class uses morphio immutable class by composition, istead of inheritance. (#979)
+- Morphology level radial distance features use the soma as reference point. (#1030)
+- Make ``neurom.core.Population`` resolve paths. Symlinks are not resolved. (#1047)
+- Mixed subtree processing can be used in morph_stats app via the use_subtrees flag. (#1034)
+- ``neurom.view.[plot_tree|plot_tree3d|plot_soma|plot_soma3D]`` were hidden from the
+  neurom.view module. They can still be imported from neurom.view.matplotlib_impl. (#1032)
+- Mixed subtree processing. (#981)
+- Deprecated modules and classes were removed. (#1026)
+
+
 Version 3.2.3
 -------------