public void setShowNowLine(boolean showNowLine) {
        this.mShowNowLine = showNowLine;
        invalidate();
    }
Set whether "now" line should be displayed. "Now" line is defined by the attributes
`nowLineColor` and `nowLineThickness`.
@param showNowLine True if "now" line should be displayed.
library/src/main/java/com/alamkanak/weekview/WeekView.java