add pandas index to encoder (#172) #91

Job	Run time
Test against different Python versions (3.7, ubuntu-latest)	38s
Test against different Python versions (3.7, windows-latest)	1m 34s
Test against different Python versions (3.7, macos-latest)	38s
Test against different Python versions (3.8, ubuntu-latest)	34s
Test against different Python versions (3.8, windows-latest)	1m 22s
Test against different Python versions (3.8, macos-latest)	42s
Test against different Python versions (3.9, ubuntu-latest)	40s
Test against different Python versions (3.9, windows-latest)	2m 3s
Test against different Python versions (3.9, macos-latest)	1m 1s
Test against different Python versions (3.10, ubuntu-latest)	28s
Test against different Python versions (3.10, windows-latest)	1m 42s
Test against different Python versions (3.10, macos-latest)	56s
Test against different Python versions (3.11, ubuntu-latest)	29s
Test against different Python versions (3.11, windows-latest)	1m 43s
Test against different Python versions (3.11, macos-latest)	56s
	15m 26s

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