Update specs/core/0_beacon-chain.md

Co-Authored-By: vbuterin <v@buterin.com>
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Hsiao-Wei Wang 2019-03-01 19:12:21 -06:00 committed by GitHub
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@ -1787,7 +1787,7 @@ def get_current_total_balance(state: BeaconState) -> Gwei:
```
```python
def get_previous_total_balance(state: BeaconState):
def get_previous_total_balance(state: BeaconState) -> Gwei:
return get_total_balance(state, get_active_validator_indices(state.validator_registry, previous_epoch))
```