add type hint for `Minio.init` #111

Job	Run time
Test on python 3.7 and ubuntu-latest	2m 35s
Test on python 3.7 and windows-latest	4m 1s
Test on python 3.7 and macos-latest	17s
Test on python 3.8 and ubuntu-latest	2m 1s
Test on python 3.8 and windows-latest	2m 13s
Test on python 3.8 and macos-latest	17s
Test on python 3.9 and ubuntu-latest	2m 32s
Test on python 3.9 and windows-latest	2m 15s
Test on python 3.9 and macos-latest	20s
Test on python 3.10 and ubuntu-latest	2m 7s
Test on python 3.10 and windows-latest	3m 16s
Test on python 3.10 and macos-latest	26s
Test on python 3.11 and ubuntu-latest	1m 41s
Test on python 3.11 and windows-latest	2m 45s
Test on python 3.11 and macos-latest	22s
	27m 8s

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