[aur-general] merge request

[G. Schlisio]

please merge r-mvtnorm [0] into r-cran-mvtnorm [1], as the latter 
follows the common naming scheme and is up to date.
thanks
[0] https://aur.archlinux.org/packages/r-mvtnorm/
[1] https://aur.archlinux.org/packages/r-cran-mvtnorm/