move servr from Suggests to Imports

DESCRIPTION

@@ -62,6 +62,7 @@ Description: Functions are provided for defining animated,
 Depends:
     R (>= 3.4.0)
 Imports:
+    servr,
     digest,
     RJSONIO,
     grid,
@@ -75,7 +76,6 @@ Imports:
     data.table (>= 1.9.8),
     methods
 Suggests:
-    servr,
     gert, gitcreds, gh,
     sp,
     gistr (>= 0.2),

NEWS.md

@@ -1,5 +1,6 @@
 # Changes in version 2023.12.14 (PR#112)
 
+- move servr from Suggests to Imports, for more user-friendly installation / getting started for newbies (no need for separate install command for servr).
 - bugfix in compiler height_proportion computation, which occured in ggplots with space=free and both vertical/horizontal panels. Before the vertical panels were always the same size, now they can be different sizes.
 
 # Changes in version 2023.11.21

R/z_animint.R

@@ -236,8 +236,7 @@ storeLayer <- function(meta, g, g.data.varied){
 #'   determine how. If it is set to "browseURL" then we use a file URL
 #'   (be sure to configure your browser to allow access to local
 #'   files, as some browsers block this by default). Otherwise
-#'   (default) if servr package is installed, we use
-#'   \code{servr::httd(out.dir)}.
+#'   (default) we use \code{servr::httd(out.dir)}.
 #' @param css.file character string for non-empty css file to
 #'   include. Provided file will be copied to the output directory as
 #'   styles.css
@@ -658,11 +657,7 @@ animint2dir <- function(plot.list, out.dir = NULL,
       u <- normalizePath(file.path(out.dir, "index.html"))
       browseURL(u)
     } else {
-      if (requireNamespace("servr")){
-        servr::httd(normalizePath(out.dir,winslash="/"))
-      } else {
-        warning('open.browser=TRUE but servr package not installed; try install.packages("servr") or options(animint.browser="browseURL")')
-      }
+      servr::httd(normalizePath(out.dir,winslash="/"))
     }
   }