Fixed incorrect BinIndex type

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (a669089) 66.15% compared to head (8eec34f) 66.26%. Report is 17 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #162 +/- ## ========================================== + Coverage 66.15% 66.26% +0.10% ========================================== Files 20 20 Lines 2819 2819 ========================================== + Hits 1865 1868 +3 + Misses 954 951 -3 ``` | [Files](https://app.codecov.io/gh/pegasystems/pega-datascientist-tools/pull/162?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pegasystems) | Coverage Δ | | |---|---|---| | [python/pdstools/adm/ADMTrees.py](https://app.codecov.io/gh/pegasystems/pega-datascientist-tools/pull/162?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pegasystems#diff-cHl0aG9uL3Bkc3Rvb2xzL2FkbS9BRE1UcmVlcy5weQ==) | `80.96% <ø> (ø)` | | | [python/pdstools/utils/table\_definitions.py](https://app.codecov.io/gh/pegasystems/pega-datascientist-tools/pull/162?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pegasystems#diff-cHl0aG9uL3Bkc3Rvb2xzL3V0aWxzL3RhYmxlX2RlZmluaXRpb25zLnB5) | `100.00% <100.00%> (ø)` | | ... and [2 files with indirect coverage changes](https://app.codecov.io/gh/pegasystems/pega-datascientist-tools/pull/162/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pegasystems)

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