Updated authorship for 4.12.0

Updated CHANGELOG for 4.11

Revert S3 client initialization added in conda#10516 (conda#10759)

* Revert "Don't create unused s3 client at import time (conda#10516)" [commit 1456484]
* Update changelog

Fix conda#10756.

* Add `--dry-run` option to `conda env create` (conda#10635)

* Print warning about pip-installed dependencies only once (conda#10638)
* Explicit install now respects `--download-only` flag (conda#10688)
* Bump vendored tqdm version (conda#10721)

* Fix `changeps1` handling for PowerShell (conda#10624)
* Handle unbound `$PS1` so sh activation does not fail with `set -u` (conda#10701)
* Fix sh activation so `$PATH` is properly restored on errors (conda#10631)
* Fix `-c` option handling so defaults channel is not always re-added (conda#10735)
* Fix artifact verification-related warnings and errors (conda#10627, conda#10677)
* Fix log level used in `conda/core/prefix_data.py` (conda#9998)
* Fix log level used when fetching artifact verification metadata (conda#10621)
* Don't create an unused S3 client at import time (conda#10516)
* Don't load `binstar_client` until needed (conda#10692)
* Reflect dropping of older Python versions in `setup.py` (conda#10642)

* Merge release notes and changelog to reduce maintenance burden (conda#10745)
* Add mentions to PyPy, Anaconda terms of service (conda#10329, conda#10712)
* Update Python versions in examples (conda#10329, conda#10744)
* Update install macOS instructions (conda#10728)

* @AlbertDeFusco
* @awwad
* @casperdcl
* @cgranade
* @chenghlee
* @ColemanTom
* @dan-hook
* @dbast
* @ericpre
* @HedgehogCode
* @jamesp
* @jezdez
* @johnhany97
* @lightmare
* @mattip
* @maxerbubba
* @mrakitin
* @stinos
* @thermokarst

Release conda 4.10.1

Bug fixes:
* Fix version detection for `__linux` virtual package (conda#10599)
* Fix import from `conda_content_trust` (conda#10589)
* Fix how URL for verification metadata files are constructed (conda#10617)
* Partially fix profile `$PATH` setup on MSYS2 (conda#10459)
* Remove `.empty` directory even when `rsync` is not installed (conda#10331)

Contributors:
* @awwad
* @chenghlee
* @codepage949
* @niklasholm

Release conda 4.10.0

NOTE: This release formally drops support for Python 2.7 and Python < 3.6.

Enhancements:
* Add pilot support for metadata signatures and verification (conda#10578)
* Add `__linux` virtual package (conda#10552, conda#10561)
* Support nested keys when using `conda config --get` (conda#10447, conda#10572)
* Support installing default packages when using `conda env create` (conda#10530)
* Support HTTP sources for `conda env update -f` (conda#10536)
* Make macOS code signing operations less verbose (conda#10372)

Bug fixes:
* Fix `conda search` crashing on Python 3.9 (conda#10542)
* Allow `{channel}::pip` to satisfy pip requirements (conda#10550)
* Support `{host}:{port}` specifications in environment YAML files (conda#10417)
* Fall back to system `.condarc` if user `.condarc` is absent (conda#10479)
* Try UTF-16 if UTF-8 fails when reading environment YAML files (conda#10356)
* Properly parse Python version >= 3.10 (conda#10478)
* Fix zsh initialization when `$ZDOTDIR` is defined (conda#10413)
* Fix path handling for csh (conda#10410)
* Fix `setup.py` requirement for vendored `ruamel_yaml_conda` (conda#10441)
* Fix errors when pickling vendored `auxlib` objects (conda#10386)

Docs:
* Document the `__unix` and `__windows` virtual packages (conda#10511)
* Update list of supported and default versions of Python (conda#10531)
* Favor using `pip` instead of `setup.py` when setting up CI (conda#10308)

Contributors:
* @awwad
* @BastianZim
* @beenje
* @bgobbi
* @blubs
* @chenghlee
* @cjmartian
* @ericpre
* @erykoff
* @felker
* @giladmaya
* @jamesmyatt
* @mingwandroid
* @opoplawski
* @saadparwaiz1
* @saucoide

4.9.2 changelog

Merge pull request conda#10316 from chenghlee/changelog-4.9.1

4.9.1 changelog

4.9.0 (2020-10-19)

Enhancements:
* Add `osx-arm64` as a recognized platform (conda#10128, conda#10134, conda#10137)
* Resign files modified during installation on ARM64 macOS (conda#10260)
* Add `__archspec` virtual package to identify CPU microarchitecture (conda#9930)
* Add `__unix` and `__win` virtual packages (conda#10214)
* Add `--no-capture--output` option to `conda run` (conda#9646)
* Add `--live-stream` option to `conda run` (conda#10270)
* Export and import environment variables set using `conda env config` (conda#10169)
* Cache repodata from `file://` channels (conda#9730)
* Do not relink already-installed packages (conda#10208)
* Speed up JSON formatting in logz module (conda#10189)

Bug fixes:
* Stop `env remove --dry-run` from actually removing environments (conda#10261)
* Virtual package requirements are now considered by the solver (conda#10057)
* Fix cached filename processing when using only tar.bz2 (conda#10193)
* Stop showing solver hints about CUDA when it is not a dependency (conda#10275)
* Ignore virtual packages when checking environment consistency (conda#10196)
* Fix `config --json` output errors in certain circumstances (conda#10194)
* More consistent error handling by `conda shell` (conda#10238)
* Bump vendored version of tqdm to fix various threading and I/O bugs (conda#10266)

Docs:
* Correctly state default `/AddToPath` option in Windows installer (conda#10179)
* Fix typos in `--repodata-fn` help text (conda#10279)

Miscellaneous:
* Update CI infrastructure to use GitHub Actions (conda#10176, conda#10186, conda#10234)
* Update README badge to show GitHub Actions status (conda#10254)

Contributors
* @AlbertDeFusco
* @angloyna
* @bbodenmiller
* @casperdcl
* @chenghlee
* @chrisburr
* @cjmartian
* @dhirschfeld
* @ericpre
* @gabrielcnr
* @InfiniteChai
* @isuruf
* @jjhelmus
* @LorcanHamill
* @maresb
* @mingwandroid
* @mlline00
* @xhochy
* @ydmytryk

4.8.5 changelog