Add release notes for v0.4.2. #4

Job	Run time
Verify Docs Build / Verify RTD Docs	10m 12s
ci / Pre-commit checks / Pre-commit Checks	1m 10s
ci / Check towncrier / Towncrier Checks	41s
ci / Python Package (android) / Create Python Package	1m 1s
ci / Python Package (cocoa) / Create Python Package	53s
ci / Python Package (core) / Create Python Package	56s
ci / Python Package (demo) / Create Python Package	1m 8s
ci / Python Package (dummy) / Create Python Package	55s
ci / Python Package (gtk) / Create Python Package	54s
ci / Python Package (iOS) / Create Python Package	58s
ci / Python Package (textual) / Create Python Package	53s
ci / Python Package (toga) / Create Python Package	1m 6s
ci / Python Package (web) / Create Python Package	51s
ci / Python Package (winforms) / Create Python Package	56s
ci / core (macos, 3.8)	1m 24s
ci / core (macos, 3.9)	1m 35s
ci / core (macos, 3.10)	1m 26s
ci / core (macos, 3.11)	1m 19s
ci / core (macos, 3.12)	1m 16s
ci / core (ubuntu, 3.8)	40s
ci / core (ubuntu, 3.9)	56s
ci / core (ubuntu, 3.10)	39s
ci / core (ubuntu, 3.11)	38s
ci / core (ubuntu, 3.12)	55s
ci / core (windows, 3.8)	1m 31s
ci / core (windows, 3.9)	1m 15s
ci / core (windows, 3.10)	1m 26s
ci / core (windows, 3.11)	1m 15s
ci / core (windows, 3.12)	1m 45s
ci / Combine & check core coverage.	34s
ci / testbed (macOS)	4m 26s
ci / testbed (windows)	4m 9s
ci / testbed (linux)	3m 19s
ci / testbed (android)	7m 2s
ci / testbed (iOS)	12m 36s
Create GitHub release	0s
Publish to TestPyPI	0s
	1h 12m 40s

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