Reset release notes after release of v0.3.1 #306

Job	Run time
Build distribution packages	22s
Test with nox (ubuntu-20.04, 3.11, ci_checks_max)	1m 14s
Test with nox (ubuntu-20.04, 3.11, pytest_min)	46s
Test documentation website generation	48s
Cross-arch tests with nox	0s
Cross-arch tests with nox	0s
Test package installation in different architectures	1m 42s
Test with nox	1s
Publish documentation website to GitHub pages	0s
Create GitHub release	0s
Publish packages to PyPI	0s
	4m 53s

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