try to fix a few R cmd check notes

Author: jgabry

DESCRIPTION

@@ -45,6 +45,7 @@ Imports:
     rlang (>= 0.4.7)
 Suggests:
     bayesplot,
+    ggplot2,
     knitr (>= 1.37),
     loo (>= 2.0.0),
     rmarkdown,

R/model.R

@@ -1,6 +1,6 @@
 #' Create a new CmdStanModel object
 #'
-#' @description \if{html}{\figure{logo.png}{options: width="25px"}}
+#' @description \if{html}{\figure{logo.png}{options: width=25}}
 #'   Create a new [`CmdStanModel`] object from a file containing a Stan program
 #'   or from an existing Stan executable. The [`CmdStanModel`] object stores the
 #'   path to a Stan program and compiled executable (once created), and provides

README.md

@@ -27,7 +27,7 @@ releases.
 * Modularity: CmdStanR runs Stan's algorithms and lets downstream modules do the
 analysis.
 
-* Flexible [BSD-3 license](https://opensource.org/licenses/BSD-3-Clause).
+* Flexible [BSD-3 license](https://opensource.org/license/bsd-3-clause/).
 
 
 ### Installation