Fix for #4 - Try to resolve version conflicts on Rack 2.0.x vs Rack 1.6.x
Fix for #4 - Try to resolve version conflicts on Rack 2.0.x vs Rack 1.6.x

For now I'm going to pin the version to the last 1.6.x version (1.6.4) and later on try to
figure out what can we do insted

SparkHub/four_o_four,esparta/four_o_four,SparkHub/four_o_four,esparta/four_o_four