version 0.0.3a1 in 2019/02/19
  * text function will escape dangerous characters.
  * rtext function added.
  * Now you can select HTML renderer.

version 0.0.2a3 in 2019/02/15
  * Fixed setup.py

version 0.0.2a2 in 2019/02/15
  * Update docstrings and create document.

version 0.0.2a1 in 2019/02/15
  * Bug fix
    meta and link function is not working.
  * Added createHeader function

version 0.0.1a1 in 2019/02/14
  * Initial release
