add example showing use of list of dates with issues

Author: nmdefries

DESCRIPTION

@@ -45,6 +45,7 @@ Suggests:
     ggplot2,
     knitr,
     maps,
+    mapproj,
     rmarkdown,
     rlang,
     testthat (>= 3.1.5),

vignettes/epidatr.Rmd

@@ -192,7 +192,7 @@ ggplot(epidata, aes(x = time_value, y = value)) +
 `ggplot2` can also be used to [create choropleths](https://r-graphics.org/recipe-miscgraph-choropleth).
 
 
-```{r class.source = "fold-hide", out.height="65%"}
+```{r, class.source = "fold-hide", out.height="65%"}
 library(maps)
 
 # Obtain the most up-to-date version of the smoothed covid-like illness (CLI)

vignettes/versioned-data.Rmd

@@ -110,6 +110,20 @@ Note that these results include only data issued or updated between
 2020-04-15, and never updated, a query for issues between 2020-05-01 and
 2020-05-15 will not include that value among its results.
 
+The `issues` parameter also accepts a list of dates.
+
+```{r, eval = FALSE}
+pub_covidcast(
+  source = "doctor-visits",
+  signals = "smoothed_adj_cli",
+  time_type = "day",
+  time_values = epirange("2020-05-01", "2020-05-01"),
+  geo_type = "state",
+  geo_values = "pa",
+  issues = c("2020-05-07", "2020-05-09", "2020-05-15")
+)
+```
+
 
 ### Observations issued with a specific lag