Add *.png to the list of files in .gitignore
Add *.png to the list of files in .gitignore

pierrelb/RMG-Py,nyee/RMG-Py,nickvandewiele/RMG-Py,chatelak/RMG-Py,nickvandewiele/RMG-Py,nyee/RMG-Py,pierrelb/RMG-Py,chatelak/RMG-Py