Bump version to 3.1.0

Includes bug fixes from PRs #127-#129 (nested sanitization,
timezone-aware datetime, falsy ID validation). Also backfills
the missing 3.0.0 changelog section.

Author: hownowstephen

CHANGELOG.md

@@ -1,11 +1,28 @@
 # Changelog
 
 ## Unreleased
+
+## [3.1.0]
+### Fixed
+- Fix nested sanitization of datetime and NaN values in dicts and lists ([#127](https://github.com/customerio/customerio-python/pull/127))
+- Fix timezone-aware datetime conversion silently discarding timezone offset ([#128](https://github.com/customerio/customerio-python/pull/128))
+- Fix falsy ID validation rejecting valid values like integer `0` ([#129](https://github.com/customerio/customerio-python/pull/129))
+
+## [3.0.0]
 ### Added
-- Add support for optional top-level `id` and `timestamp` event fields in `track()` and `track_anonymous()`.
+- Add `batch()` method to CustomerIO track client ([#123](https://github.com/customerio/customerio-python/pull/123))
+- Add context manager and `close()` to ClientBase ([#121](https://github.com/customerio/customerio-python/pull/121))
+- Add automated PyPI publish workflow for wheel and sdist ([#120](https://github.com/customerio/customerio-python/pull/120))
+- Add TCP keepalive socket options ([#124](https://github.com/customerio/customerio-python/pull/124))
+- Add support for optional top-level `id` and `timestamp` event fields in `track()` and `track_anonymous()` ([#125](https://github.com/customerio/customerio-python/pull/125))
 
 ### Changed
-- `track()` and `track_anonymous()` now take custom event attributes in the `data` dict instead of arbitrary keyword arguments.
+- `track()` and `track_anonymous()` now take custom event attributes in the `data` dict instead of arbitrary keyword arguments ([#125](https://github.com/customerio/customerio-python/pull/125))
+- Return response objects from all client methods ([#122](https://github.com/customerio/customerio-python/pull/122))
+
+### Fixed
+- Fix retry logic for POST requests ([#119](https://github.com/customerio/customerio-python/pull/119))
+- Fix no-pooling session isolation ([#118](https://github.com/customerio/customerio-python/pull/118))
 
 ## [2.4]
 ### Added

customerio/__version__.py

@@ -1 +1 @@
-__version__ = "3.0.0"
+__version__ = "3.1.0"