need `return` statements in `_find_neighbor()` & `_update_point()`

[jGaboardi]

• Came across this while working on add type hints #55
• Do does there actually need to be return statements in _find_neighbor()¹ and _update_point()²? The values are being set to the data structure itself, and there appears to be nothing being return in the current functional codebase.
• The unknown here is the currently commented out merge_closest()³ method that may in fact need to return a value
• xref:
  • info & background on merge_closest() method #34

cc @gegen07

Footnotes

1. https://github.com/carsonfarmer/fastpair/blob/d2b38aad4597ec5d2572a9b5d2abbd60905e92fe/fastpair/base.py#L226 ↩

2. https://github.com/carsonfarmer/fastpair/blob/d2b38aad4597ec5d2572a9b5d2abbd60905e92fe/fastpair/base.py#L259 ↩

3. https://github.com/carsonfarmer/fastpair/blob/d2b38aad4597ec5d2572a9b5d2abbd60905e92fe/fastpair/base.py#L265 ↩