Remove Oasa library from requirements.txt
Remove Oasa library from requirements.txt

This is no longer needed.
nickvandewiele/RMG-Py,enochd/RMG-Py,chatelak/RMG-Py,nickvandewiele/RMG-Py,pierrelb/RMG-Py,nyee/RMG-Py,enochd/RMG-Py,comocheng/RMG-Py,chatelak/RMG-Py,pierrelb/RMG-Py,comocheng/RMG-Py,nyee/RMG-Py