add type hint for `Minio.get_object` #131

Job	Run time
Test on python 3.7 and ubuntu-latest	2m 39s
Test on python 3.7 and windows-latest	3m 22s
Test on python 3.7 and macos-latest	22s
Test on python 3.8 and ubuntu-latest	2m 38s
Test on python 3.8 and windows-latest	3m 5s
Test on python 3.8 and macos-latest	29s
Test on python 3.9 and ubuntu-latest	2m 8s
Test on python 3.9 and windows-latest	2m 37s
Test on python 3.9 and macos-latest	17s
Test on python 3.10 and ubuntu-latest	2m 44s
Test on python 3.10 and windows-latest	2m 46s
Test on python 3.10 and macos-latest	21s
Test on python 3.11 and ubuntu-latest	2m 4s
Test on python 3.11 and windows-latest	3m 5s
Test on python 3.11 and macos-latest	19s
	28m 56s

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