add Krylovkit 0.6 to compat (#35) #14

Job	Run time
Julia 1.6 - ubuntu-latest - x64	23m 30s
Julia 1.6 - macOS-latest - x64	25m 27s
Julia 1.6 - windows-latest - x64	32m 44s
Julia 1 - ubuntu-latest - x64	15m 41s
Julia 1 - macOS-latest - x64	14m 22s
Julia 1 - windows-latest - x64	15m 44s
Julia nightly - ubuntu-latest - x64	17m 53s
Julia nightly - macOS-latest - x64	20m 47s
Julia nightly - windows-latest - x64	17m 26s
	3h 3m 34s

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