add type hint for `Minio.init` #126

Job	Run time
Test on python 3.7 and ubuntu-latest	2m 41s
Test on python 3.7 and windows-latest	3m 27s
Test on python 3.7 and macos-latest	23s
Test on python 3.8 and ubuntu-latest	2m 38s
Test on python 3.8 and windows-latest	2m 54s
Test on python 3.8 and macos-latest	19s
Test on python 3.9 and ubuntu-latest	2m 5s
Test on python 3.9 and windows-latest	2m 28s
Test on python 3.9 and macos-latest	59s
Test on python 3.10 and ubuntu-latest	2m 55s
Test on python 3.10 and windows-latest	2m 41s
Test on python 3.10 and macos-latest	17s
Test on python 3.11 and ubuntu-latest	2m 0s
Test on python 3.11 and windows-latest	2m 37s
Test on python 3.11 and macos-latest	22s
	28m 46s

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