Add ecdsa to Python's section (#153)

* Add Password4j to Java

* Update README.md

README.md

@@ -347,6 +347,7 @@ encryption library providing MD5, SHA1, SHA2 hashing and HMAC functionality, as
 - [cryptography](https://cryptography.io/en/latest/) - Python library which exposes cryptographic recipes and primitives.
 - [cryptopy](https://sourceforge.net/projects/cryptopy/) - Pure python implmentation of cryptographic algorithms and applications.
 - [django-cryptography](https://github.com/georgemarshall/django-cryptography) - Easily encrypt data in Django.
+- [ecdsa](https://github.com/tlsfuzzer/python-ecdsa) - An easy-to-use implementation of ECC with support for ECDSA and ECDH.
 - [hashids](https://github.com/davidaurelio/hashids-python) - Implementation of [hashids](http://hashids.org) in Python.
 - [paramiko](http://www.paramiko.org/) - Python implementation of the SSHv2 protocol, providing both client and server functionality.
 - [Privy](https://github.com/ofek/privy) - An easy, fast lib to correctly password-protect your data.