Adaptating your TSL2561 library for Python 3

[Balth-D]

Hi, I found your TSL2561 on gitHub, and it was very useful for me ! I'm using Python 3, so I had to adapt your code, and to thank you for the help, I share my code with the community ;) The adaptation work was on the print -> print() and the use of the updated Adafruit I2C module