vignette: Use ‘BiocManager::install’ instead of ‘biocLite’.
vignette: Use ‘BiocManager::install’ instead of ‘biocLite’.

BiocManager is the new preferred way of installing things from
Bioconductor.

* vignettes/Introduction_to_MutationalPatterns.Rnw: Use
  ‘BiocManager::install’ instead of ‘biocLite’.

CuppenResearch/MutationalPatterns