Log Message:
py-bitarray: updated to 1.7.1

2021-03-12   1.7.1:
-------------------
  * fix issue 114, raise TypeError when incorrect index is used during
    assignment, e.g. `a[1.5] = 1`
  * raise TypeError (not IndexError) when assigning slice to incorrect type,
    e.g. `a[1:4] = 1.2`
  * improve some docstrings and tests

2021-02-27   1.7.0:
-------------------
  * add `bitarray.util.urandom()`
  * raise TypeError when trying to extend bitarrays from bytes on Python 3,
    ie. `bitarray(b'011')` and `.extend(b'110')`.  (Deprecated since 1.4.1)