CHANGES IN VERSION 0.99.11
------------------------
 o geom_genotype <2017-08-29, Tue>

CHANGES IN VERSION 0.99.10
------------------------
 o geom_hybrid <2017-08-17, Thu>

CHANGES IN VERSION 0.99.9
------------------------
 o hybrid_plot <2017-06-30, Fri>

CHANGES IN VERSION 0.0.3
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 o more parameters for plot, by, xlab, color, fill etc.

CHANGES IN VERSION 0.0.2
------------------------
 o add vignette

CHANGES IN VERSION 0.0.1
------------------------
 o initial version with plot method for nucleotide differences between twwo aligned sequences <2016-11-16, Wed>