v1.4.2

• show_trndseason() has option usearrow to plot points as up or down arrows for trend direction
• show_metseason() no longer returns ambiguous error if yrstr or yrend are NULL
• show_mettrndseason() function added to plot trend and seasonal metrics in a single plot
• All show_*() functions no longer have serif base font
• Added col argument for line color to show_prdseries()
• Added GitHub URLs to DESCRIPTION