Update to SFML 3.0.2

Update to SFML 2.6.2

Version 1.3 (based on sfml2)

Fixed links in README.rst and a merge error in setup.py

Version 1.1 (based on sfml2-rc)

Version 1.0 (based on sfml2-rc)

Version 0.9 (based on sfml1.9)