add type hint for `Minio.init` #134

Job	Run time
Test on python 3.7 and ubuntu-latest	2m 33s
Test on python 3.7 and windows-latest	3m 22s
Test on python 3.7 and macos-latest	17s
Test on python 3.8 and ubuntu-latest	2m 11s
Test on python 3.8 and windows-latest	3m 33s
Test on python 3.8 and macos-latest	18s
Test on python 3.9 and ubuntu-latest	2m 11s
Test on python 3.9 and windows-latest	2m 47s
Test on python 3.9 and macos-latest	18s
Test on python 3.10 and ubuntu-latest	2m 3s
Test on python 3.10 and windows-latest	3m 23s
Test on python 3.10 and macos-latest	18s
Test on python 3.11 and ubuntu-latest	1m 38s
Test on python 3.11 and windows-latest	2m 7s
Test on python 3.11 and macos-latest	18s
	27m 17s

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