Update changelog for version 0.6.0, bump version #8

Job	Run time
Build and release (x86_64-apple-darwin, macos-latest, gdscript-formatter-macos-x86_64)	1m 13s
Build and release (aarch64-apple-darwin, macos-latest, gdscript-formatter-macos-aarch64)	1m 4s
Build and release (x86_64-unknown-linux-gnu, ubuntu-latest, gdscript-formatter-linux-x86_64)	56s
Build and release (aarch64-pc-windows-msvc, windows-latest, gdscript-formatter-windows-aarch64.exe)	1m 59s
Build and release (x86_64-pc-windows-msvc, windows-latest, gdscript-formatter-windows-x86_64.exe)	1m 55s
Build and release (aarch64-unknown-linux-gnu, ubuntu-latest, gdscript-formatter-linux-aarch64)	2m 13s
Build and release (x86_64-unknown-linux-gnu, ubuntu-latest, gdscript-formatter-linux-x86_64)	1m 3s
Build and release (aarch64-unknown-linux-gnu, ubuntu-latest, gdscript-formatter-linux-aarch64)	2m 13s
Build and release (x86_64-apple-darwin, macos-latest, gdscript-formatter-macos-x86_64)	1m 13s
Build and release (aarch64-pc-windows-msvc, windows-latest, gdscript-formatter-windows-aarch64.exe)	1m 59s
Build and release (x86_64-pc-windows-msvc, windows-latest, gdscript-formatter-windows-x86_64.exe)	1m 55s
Build and release (aarch64-apple-darwin, macos-latest, gdscript-formatter-macos-aarch64)	1m 4s
	18m 47s

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