add type hint for `Minio.init` #114

Job	Run time
Test on python 3.7 and ubuntu-latest	3m 5s
Test on python 3.7 and windows-latest	5m 4s
Test on python 3.7 and macos-latest	20s
Test on python 3.8 and ubuntu-latest	2m 42s
Test on python 3.8 and windows-latest	2m 55s
Test on python 3.8 and macos-latest	18s
Test on python 3.9 and ubuntu-latest	2m 39s
Test on python 3.9 and windows-latest	2m 39s
Test on python 3.9 and macos-latest	20s
Test on python 3.10 and ubuntu-latest	3m 7s
Test on python 3.10 and windows-latest	3m 14s
Test on python 3.10 and macos-latest	30s
Test on python 3.11 and ubuntu-latest	1m 55s
Test on python 3.11 and windows-latest	2m 34s
Test on python 3.11 and macos-latest	28s
	31m 50s

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