Log Message:
py-validators: updated to 0.18.1

0.18.1:
- Made uuid validator accept UUID objects

0.18.0:
- Added bitcoin address validator

0.17.1:
- Fixed python_requires using twine

0.17.0:
- Added python_requires='>=3.4' to setup.py
- Fixed URL validator ip_last_octet regex

0.16.0:
- Added support for emojis and more IDNA URLs

0.15.0:
- Added bank card validators

0.14.3:
- Handle None values gracefully in domain validator
- Local part of the email address should be less or equal than 64 bytes
- Removed py27 support
- Removed pypy2 support

0.14.2:
- Made domain validation case-insensitive