TypeError in __init__.py due to attempt to concatenate list with tuple (typo?)

For StreamClosureReason, the code attempts to join a list with a tuple by using parentheses (tuple) instead of square brackets (list).

File "stem/__init__.py", line 579, in <module>
  "PRIVATE_ADDR",
TypeError: can only concatenate list (not "tuple") to list

Trac:
Username: peer