Allow multiple -d/--dep

Using repeated -d/--dep was broken in the clap upgrade.

Fixes #106.

src/arguments.rs

@@ -92,8 +92,7 @@ impl Args {
                 .help("Add a dependency - either just the package name (for the latest version) or as `name=version`")
                 .long("dep")
                 .short('d')
-                .num_args(1..)
-                .number_of_values(1)
+                .action(ArgAction::Append)
             )
             .arg(Arg::new("extern")
                 .help("Adds an `#[macro_use] extern crate name;` item for expressions and loop scripts")

tests/data/script-using-anyhow-and-serde.rs

@@ -0,0 +1,5 @@
+use anyhow::Result;
+use serde_json::from_str;
+
+println!("--output--");
+println!("Ok");

tests/tests/script.rs

@@ -281,3 +281,20 @@ fn test_extern_c_main() {
     )
     .unwrap()
 }
+
+#[test]
+#[cfg_attr(not(feature = "online_tests"), ignore)]
+fn test_script_multiple_deps() {
+    let out = rust_script!(
+        "-d",
+        "serde_json=1.0.96",
+        "-d",
+        "anyhow=1.0.71",
+        "tests/data/script-using-anyhow-and-serde.rs"
+    )
+    .unwrap();
+    scan!(out.stdout_output();
+        ("Ok") => ()
+    )
+    .unwrap()
+}