Update displays.py
Update displays.py

Handle week=255 as indication of model year, not manufacturing date. See #138 and http://en.wikipedia.org/wiki/Extended_display_identification_data#EDID_1.3_data_format
dannooooo/munkireport-php,munkireport/munkireport-php,gmarnin/munkireport-php,childrss/munkireport-php,matt-cahill/munkireport-php,munkireport/munkireport-php,matt-cahill/munkireport-php,dannooooo/munkireport-php,n8felton/munkireport-php,childrss/munkireport-php,matt-cahill/munkireport-php,childrss/munkireport-php,matt-cahill/munkireport-php,childrss/munkireport-php,childrss/munkireport-php,gmarnin/munkireport-php,dannooooo/munkireport-php,poundbangbash/munkireport-php,poundbangbash/munkireport-php,munkireport/munkireport-php,poundbangbash/munkireport-php,n8felton/munkireport-php,gmarnin/munkireport-php,dannooooo/munkireport-php,n8felton/munkireport-php,munkireport/munkireport-php,poundbangbash/munkireport-php,n8felton/munkireport-php,dannooooo/munkireport-php,matt-cahill/munkireport-php,n8felton/munkireport-php,n8felton/munkireport-php,matt-cahill/munkireport-php,poundbangbash/munkireport-php,gmarnin/munkireport-php,munkireport/munkireport-php,dannooooo/munkireport-php,childrss/munkireport-php,gmarnin/munkireport-php