message: Doc tweak by Vincent
diff: @@ -46,7 +46,7 @@ PYBIND11_MODULE(bottleneck, m) {
  bits of the mantissa may be wrong). This version of the algorithm takes
  advantage of the limited precision of `double` and is usually a lot
  faster to compute, whatever the value of `e`.
  - Thus, by default, `e` is the smallest positive double.
  + Thus, by default (`e=None`), `e` is the smallest positive double.
  :type e: float
  :rtype: float
  :returns: the bottleneck distance.
  