update copyright year to pull from Date.today.year
update copyright year to pull from Date.today.year

chosenken/docs,chosenken/docs,chosenken/docs,ddfreyne/prometheus-docs,du2016/prometheus-docs,ddfreyne/prometheus-docs,ddfreyne/prometheus-docs,du2016/prometheus-docs,du2016/prometheus-docs,prometheus/docs,ddfreyne/prometheus-docs,prometheus/docs,prometheus/docs,chosenken/docs