add type hint for `Minio.init` #139

Job	Run time
Test on python 3.7 and ubuntu-latest	2m 42s
Test on python 3.7 and windows-latest	3m 56s
Test on python 3.7 and macos-latest	28s
Test on python 3.8 and ubuntu-latest	2m 1s
Test on python 3.8 and windows-latest	2m 33s
Test on python 3.8 and macos-latest	19s
Test on python 3.9 and ubuntu-latest	2m 19s
Test on python 3.9 and windows-latest	2m 36s
Test on python 3.9 and macos-latest	20s
Test on python 3.10 and ubuntu-latest	2m 15s
Test on python 3.10 and windows-latest	2m 25s
Test on python 3.10 and macos-latest	22s
Test on python 3.11 and ubuntu-latest	1m 37s
Test on python 3.11 and windows-latest	2m 18s
Test on python 3.11 and macos-latest	21s
	26m 32s

Provide feedback