binary-search-tree: replace invalid uuid (#1111)
binary-search-tree: replace invalid uuid (#1111)

Re #1096, valid uuid is [\da-f]{8}(-[\da-f]{4}){3}-[\da-f]{12}. This exercise must've been merged after #1096 or was simply missed.
smalley/python,behrtam/xpython,N-Parsons/exercism-python,pheanex/xpython,jmluy/xpython,jmluy/xpython,smalley/python,exercism/python,exercism/python,exercism/xpython,N-Parsons/exercism-python,pheanex/xpython,behrtam/xpython,exercism/xpython