update changelog with v0.2.0 release date #6

Job	Run time
Create Release	6s
Build Release Binaries (ubuntu-latest, x86_64-unknown-linux-gnu, linux)	1m 31s
Build Release Binaries (windows-latest, x86_64-pc-windows-msvc, windows, .exe)	3m 3s
Build Release Binaries (macos-latest, x86_64-apple-darwin, macos)	1m 32s
	6m 12s

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