Added updated matplotlib requirement to README.md
Added updated matplotlib requirement to README.md

widdowquinn/Teaching-Dundee-BS32010,widdowquinn/Teaching-2015-03-17-UoD_compgenvis,widdowquinn/Teaching-Dundee-BS32010,widdowquinn/Teaching-Dundee-BS32010,widdowquinn/Teaching-2015-03-17-UoD_compgenvis,widdowquinn/Teaching-2015-03-17-UoD_compgenvis