Changed to requiring ggbio 1.8.8 because the current 1.10.10 has a minor bug that affects plotCluster(). Using ggbio 1.8.8 while the maintainer of ggbio to fixes it.
Merge pull request #12 from lcolladotor/devel

Changed to requiring ggbio 1.8.8 because the current 1.10.10 has a minor...