add type hint for `Minio.init` #130

Job	Run time
Test on python 3.7 and ubuntu-latest	26s
Test on python 3.7 and windows-latest	10s
Test on python 3.7 and macos-latest	19s
Test on python 3.8 and ubuntu-latest	7s
Test on python 3.8 and windows-latest	1s
Test on python 3.8 and macos-latest	1s
Test on python 3.9 and ubuntu-latest	1s
Test on python 3.9 and windows-latest	1s
Test on python 3.9 and macos-latest	1s
Test on python 3.10 and ubuntu-latest	31s
Test on python 3.10 and windows-latest	27s
Test on python 3.10 and macos-latest	20s
Test on python 3.11 and ubuntu-latest	25s
Test on python 3.11 and windows-latest	25s
Test on python 3.11 and macos-latest	21s
	3m 36s

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