Changed README.md
Version 0.2.19
* Added sanity check to prevent private keys on server
* Added check for password if the offical API is used
* Added different exception handlers to CLI
* Added time server
* Fixed bug if server lost connection to redis
* Fixed bug on server error response
* Fixed wrong HTTP status codes
* Changed method name in pssst.py
* Changed some unit tests
* Changed some comments
* Changed some texts
* Changed README.md
Changed API documentation
Version 0.2.20
* Added unit test for time synchronizing
* Changed CLI and server to behave accordingly to the specification
* Changed API documentation