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Fix invalid escape sequence in binary_search_tree.py (#1920)

* Fix invalid escape sequence in binary_search_tree.py

data_structures/binary_tree/binary_search_tree.py:156
  /home/travis/build/TheAlgorithms/Python/data_structures/binary_tree/binary_search_tree.py:156: DeprecationWarning: invalid escape sequence \

* fixup! Format Python code with psf/black push

Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
C
Christian Clauss committed
1ad78b2663ac6ca9cd2ce76f78305a0ea6fc3b87
Parent: 3d0680e
Committed by GitHub <noreply@github.com> on 4/30/2020, 8:47:11 PM