readme: update the requirement list
readme: update the requirement list

pierremoreau/envytools,karolherbst/envytools,hakzsam/envytools,MoochMcGee/envytools,grate-driver/envytools,hakzsam/envytools,karolherbst/envytools,envytools/envytools,pierremoreau/envytools,hakzsam/envytools,grate-driver/envytools,MoochMcGee/envytools,pierremoreau/envytools,MoochMcGee/envytools,envytools/envytools,pierremoreau/envytools,kfractal/envytools,hakzsam/envytools,kfractal/envytools,karolherbst/envytools,MoochMcGee/envytools,envytools/envytools,grate-driver/envytools,MoochMcGee/envytools,pierremoreau/envytools,envytools/envytools,hakzsam/envytools,kfractal/envytools,grate-driver/envytools,karolherbst/envytools,karolherbst/envytools,kfractal/envytools,kfractal/envytools,grate-driver/envytools,envytools/envytools