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docs: add v0.3.0 upgrade guide and update changelog (#134) #5

Job	Run time
build-release (aarch64-unknown-linux-gnu, ubuntu-latest)	3m 4s
build-release (aarch64-apple-darwin, macos-latest)	2m 33s
build-release (x86_64-apple-darwin, macos-latest)	2m 56s
build-release (x86_64-unknown-linux-gnu, ubuntu-latest)	2m 58s
build-release (x86_64-pc-windows-msvc, windows-latest)	3m 22s
create-release	0s
	14m 53s