• tweak email-validator import error message #145
• fix parse error of parse_date() and parse_datetime() when input is 0 #144, thanks @YannLuo
• add Config.anystr_strip_whitespace and strip_whitespace kwarg to constr,
  by default values is `False`` #163, thanks @Gr1N
• add ConstrainedFloat, confloat, PositiveFloat and NegativeFloat types #166, thanks @Gr1N