Update NEWS for 21.1b1

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 .. towncrier release notes start
 
+21.1b1 (2022-04-30)
+===================
+
+Process
+-------
+
+- Start migration of distribution metadata implementation from ``pkg_resources``
+  to ``importlib.metadata``. The new implementation is currently not exposed in
+  any user-facing way, but included in the code base for easier development.
+
+Deprecations and Removals
+-------------------------
+
+- Drop ``--use-deprecated=out-of-tree-build``, according to deprecation message. (`#11001 <https://github.com/pypa/pip/issues/11001>`_)
+
+Features
+--------
+
+- Add option to install and uninstall commands to opt-out from running-as-root warning. (`#10556 <https://github.com/pypa/pip/issues/10556>`_)
+- Include Project-URLs in ``pip show`` output. (`#10799 <https://github.com/pypa/pip/issues/10799>`_)
+- Improve error message when ``pip config edit`` is provided an editor that
+  doesn't exist. (`#10812 <https://github.com/pypa/pip/issues/10812>`_)
+- Add a user interface for supplying config settings to build backends. (`#11059 <https://github.com/pypa/pip/issues/11059>`_)
+- Add support for Powershell autocompletion. (`#9024 <https://github.com/pypa/pip/issues/9024>`_)
+- Explains why specified version cannot be retrieved when *Requires-Python* is not satisfied. (`#9615 <https://github.com/pypa/pip/issues/9615>`_)
+- Validate build dependencies when using ``--no-build-isolation``. (`#9794 <https://github.com/pypa/pip/issues/9794>`_)
+
+Bug Fixes
+---------
+
+- Fix conditional checks to prevent ``pip.exe`` from trying to modify itself, on Windows. (`#10560 <https://github.com/pypa/pip/issues/10560>`_)
+- Fix uninstall editable from Windows junction link. (`#10696 <https://github.com/pypa/pip/issues/10696>`_)
+- Fallback to pyproject.toml-based builds if ``setup.py`` is present in a project, but ``setuptools`` cannot be imported. (`#10717 <https://github.com/pypa/pip/issues/10717>`_)
+- When checking for conflicts in the build environment, correctly skip requirements
+  containing markers that do not match the current environment. (`#10883 <https://github.com/pypa/pip/issues/10883>`_)
+- Disable brotli import in vendored urllib3 so brotli could be uninstalled/upgraded by pip. (`#10950 <https://github.com/pypa/pip/issues/10950>`_)
+- Prioritize URL credentials over netrc. (`#10979 <https://github.com/pypa/pip/issues/10979>`_)
+- Filter available distributions using hash declarations from constraints files. (`#9243 <https://github.com/pypa/pip/issues/9243>`_)
+- Fix an error when trying to uninstall packages installed as editable from a network drive. (`#9452 <https://github.com/pypa/pip/issues/9452>`_)
+- Fix pip install issues using a proxy due to an inconsistency in how Requests is currently handling variable precedence in session. (`#9691 <https://github.com/pypa/pip/issues/9691>`_)
+
+Vendored Libraries
+------------------
+
+- Upgrade CacheControl to 0.12.11
+- Upgrade distro to 1.7.0
+- Upgrade platformdirs to 2.5.2
+- Remove ``progress`` from vendored dependencies.
+- Upgrade ``pyparsing`` to 3.0.8 for startup performance improvements.
+- Upgrade rich to 12.2.0
+- Upgrade tomli to 2.0.1
+- Upgrade typing_extensions to 4.2.0
+
+Improved Documentation
+----------------------
+
+- Add more dedicated topic and reference pages to the documentation. (`#10899 <https://github.com/pypa/pip/issues/10899>`_)
+- Capitalise Y as the default for "Proceed (y/n)?" when uninstalling. (`#10936 <https://github.com/pypa/pip/issues/10936>`_)
+- Add ``scheme://`` requirement to ``--proxy`` option's description (`#10951 <https://github.com/pypa/pip/issues/10951>`_)
+- The wheel command now references the build interface section instead of stating the legacy
+  setuptools behavior as the default. (`#10972 <https://github.com/pypa/pip/issues/10972>`_)
+- Improved usefulness of ``pip config --help`` output. (`#11074 <https://github.com/pypa/pip/issues/11074>`_)
+
+
 22.0.4 (2022-03-06)
 ===================