CHANGES IN VERSION 0.1.0
------------------------
 o update vignette <2017-12-04, Mon>
 o geom_subview now supports aes mapping <2017-11-21, Tue>

CHANGES IN VERSION 0.0.7
------------------------
 o geom_subview compatible with meme object <2017-10-24, Tue>
   + https://github.com/GuangchuangYu/meme

CHANGES IN VERSION 0.0.6
------------------------
 o add image_fun parameter; user can use magick function to process image <2017-10-17, Tue>
 o using magick to read image instead of EBImage <2017-10-17, Tue>

CHANGES IN VERSION 0.0.5
------------------------
 o geom_icon <2017-09-05, Wed>

CHANGES IN VERSION 0.0.4
------------------------
 o geom_emoji <2017-03-23, Thu>
 o geom_flag <2017-03-22, Wed>
 o support size = Inf <2017-03-22, Wed>
 o geom_phylopic layer <2017-03-22, Wed>
 o color parameter for geom_image and related layers <2017-03-22, Wed>
 o geom_pokemon <2017-03-22, Wed>

CHANGES IN VERSION 0.0.3
------------------------
 o geom_subview <2017-03-21, Tue>
 o theme_transparent from ggtree <2017-03-21, Tue>

CHANGES IN VERSION 0.0.2
------------------------
 o remove parsing `image` parameter via `...`, and set image="https://www.r-project.org/logo/Rlogo.png" by default <2017-02-22, Wed>

CHANGES IN VERSION 0.0.1
------------------------
 o geom_image layer <2017-02-21, Tue>
