Port release notes from 0.7.1 to main

CHANGELOG.rst

@@ -45,6 +45,25 @@ In progress:
  - remove the `Calendar._timezones` attribute
  - added support for parsing and serializing Timezones
 
+*****
+0.7.1
+*****
+
+This release contains a few minor changes and introduces deprecations for
+features that will be removed in 0.8.
+
+Deprecation:
+ - Add warnings about breaking changes in v0.8 to `Calendar.str()` and `.iter()`.
+
+Minor changes:
+ - Add a dependency on `attrs <https://pypi.org/project/attrs/>`_.
+ - Remove the upper bound on the version of `arrow <https://pypi.org/project/arrow/>`_.
+ - Backport optimizations for TatSu parser from 0.8
+
+Bug fix:
+ - Fix "falsey" (`bool(x) is False`) alarm trigger (i.e. `timedelta(0)`) not being serialized `#269 <https://github.com/ics-py/ics-py/issues/269>`_
+
+
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 0.7 - Katherine Johnson
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