add strokewidth parameter to image_annotate

[retowyss]

Adding missing strokewidth parameter to image_annotate.

library(magick)

img <- image_blank(480, 320)

image_annotate(img, "Strokewidth Test", size = 60, strokecolor = "red", strokewidth = 1)
image_annotate(img, "Strokewidth Test", size = 60, strokecolor = "red", strokewidth = 2)

[jeroen]

Thanks!