fix vignette for cran

[ci skip]

Author: jgabry

.Rbuildignore

@@ -11,3 +11,4 @@ LICENSE
 ^revdep$
 man-roxygen/*
 vignettes/rstanlm
+^CRAN-RELEASE$

DESCRIPTION

@@ -28,7 +28,7 @@ Description: Provides various tools for developers of R packages interfacing
     across 'Stan'-based R packages, and vignettes with recommendations for 
     developers.
 License: GPL (>=3)
-URL: https://discourse.mc-stan.org/, https://mc-stan.org/rstantools/
+URL: https://mc-stan.org/rstantools/, https://discourse.mc-stan.org/
 BugReports: https://github.com/stan-dev/rstantools/issues
 Encoding: UTF-8
 LazyData: true

vignettes/minimal-rstan-package.Rmd

@@ -273,8 +273,11 @@ documentation, you can set `quick=TRUE` to speed up the process, or use
 
 After installation, the package can be loaded and used like any other R package:
 
-```{r}
+```{r, eval=FALSE}
 library("rstanlm")
+```
+
+```{r}
 fit <- lm_stan(y = rnorm(10), x = rnorm(10), 
                # arguments passed to sampling
                iter = 2000, refresh = 500)