Bump version to 0.4.0 #52

Job	Run time
Run rustfmt	5s
Run clippy	8s
Run cargo check with 1.61.0 on ubuntu-latest	46s
Run cargo check with stable on ubuntu-latest	6s
Run cargo check with beta on ubuntu-latest	14s
Run cargo check with nightly on ubuntu-latest	14s
Run cargo check with 1.61.0 on macos-latest	59s
Run cargo check with stable on macos-latest	9s
Run cargo check with beta on macos-latest	16s
Run cargo check with nightly on macos-latest	17s
Run cargo check with 1.61.0 on windows-latest	1m 15s
Run cargo check with stable on windows-latest	32s
Run cargo check with beta on windows-latest	35s
Run cargo check with nightly on windows-latest	32s
Run tests with 1.61.0 on ubuntu-latest	56s
Run tests with stable on ubuntu-latest	15s
Run tests with beta on ubuntu-latest	20s
Run tests with nightly on ubuntu-latest	21s
Run tests with 1.61.0 on macos-latest	54s
Run tests with stable on macos-latest	16s
Run tests with beta on macos-latest	28s
Run tests with nightly on macos-latest	21s
Run tests with 1.61.0 on windows-latest	1m 31s
Run tests with stable on windows-latest	45s
Run tests with beta on windows-latest	41s
Run tests with nightly on windows-latest	37s
	13m 33s

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