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>
