[R-pkgs] valaddin (0.1.0): Make your functions more robust

[Eugene Ha]

Dear fellow R users,

valaddin (0.1.0) has been published on CRAN:
https://cran.r-project.org/package=valaddin

Using valaddin, you can transform an existing function into a function with
input validation, without having to rewrite it with stop() or stopifnot()
statements. It therefore provides a convenient and consistent way to make
your functions more robust and more predictable, either interactively at
the console, or in your programs.

To learn more, see:

- The landing page of the source repository:
  https://github.com/egnha/valaddin

- The package vignette, which gives an overview of use cases:
  https://cran.r-project.org/package=valaddin/vignettes/valaddin.html

Bug reports and other feedback are welcome at the issues page on GitHub:
https://github.com/egnha/valaddin/issues

- Eugene Ha