Update changelog for release 0.12.3 (#2455)

CHANGELOG.md

@@ -1,3 +1,27 @@
+## v0.12.3
+### Improvements
+- Fast addition of nodes to groups with `skip_orm=True` [[#2471]](https://github.com/aiidateam/aiida_core/pull/2471)
+- Add `environment.yml` for installing dependencies using conda; release of `aiida-core` on conda-forge channel [[#2081]](https://github.com/aiidateam/aiida_core/pull/2081)
+- REST API: io tree response now includes link type and node label [[#2033]](https://github.com/aiidateam/aiida_core/pull/2033) [[#2511]](https://github.com/aiidateam/aiida_core/pull/2511)
+- Backport postgres improvements for quicksetup [[#2433]](https://github.com/aiidateam/aiida_core/pull/2433)
+- Backport `aiida.get_strict_version` (for plugin development) [[#2099]](https://github.com/aiidateam/aiida_core/pull/2099)
+
+### Minor bug fixes
+- Fix security vulnerability by upgrading `paramiko` to `2.4.2` [[#2043]](https://github.com/aiidateam/aiida_core/pull/2043)
+- Disable caching for inline calculations (broken since move to ``workfunction``-based implementation) [[#1872]](https://github.com/aiidateam/aiida_core/pull/1872)
+- Let `verdi help` return exit status 0 [[#2434]](https://github.com/aiidateam/aiida_core/pull/2434)
+- Decode dict keys only if strings (backport) [[#2436]](https://github.com/aiidateam/aiida_core/pull/2436)
+- Remove broken verdi-plug entry point [[#2356]](https://github.com/aiidateam/aiida_core/pull/2356)
+- `verdi node delete` (without arguments) no longer tries to delete all nodes [[#2545]](https://github.com/aiidateam/aiida_core/pull/2545)
+- Fix plotting of `BandsData` objects [[#2492]](https://github.com/aiidateam/aiida_core/pull/2492)
+
+### Miscellaneous
+- REST API: add tests for random sorting list entries of same type [[#2106]](https://github.com/aiidateam/aiida_core/pull/2106)
+- Add various badges to README [[#1969]](https://github.com/aiidateam/aiida_core/pull/1969)
+- Minor documentation improvements [[#1955]](https://github.com/aiidateam/aiida_core/pull/1955)
+- Add license file to MANIFEST [[#2339]](https://github.com/aiidateam/aiida_core/pull/2339)
+- Add instructions when `verdi import` fails [[#2420]](https://github.com/aiidateam/aiida_core/pull/2420)
+
 ## v0.12.2
 ### Improvements
 - Support the hashing of `uuid.UUID` types by registering a hashing function  [[#1861]](https://github.com/aiidateam/aiida_core/pull/1861)