Easily compare changes between package versions.
library(packageDiff)
a <- pkgInfo('https://cran.r-project.org/src/contrib/Archive/yaml/yaml_2.1.18.tar.gz')
b <- pkgInfo('https://cran.r-project.org/src/contrib/Archive/yaml/yaml_2.1.19.tar.gz')
pkgDiff(a, b)
library(packageDiff)
pkgDiff(pkgInfo('https://cran.r-project.org/src/contrib/Archive/Hmisc/Hmisc_4.1-1.tar.gz'),
pkgInfo('https://cran.r-project.org/src/contrib/Archive/Hmisc/Hmisc_4.2-0.tar.gz'))
library(packageDiff)
pkgDiff(pkgInfo('https://cran.r-project.org/src/contrib/Archive/ggplot2/ggplot2_3.1.0.tar.gz'),
pkgInfo('https://cran.r-project.org/src/contrib/Archive/ggplot2/ggplot2_3.2.0.tar.gz'))