Add plus sign to item id valid chars regexp (#534)

Signed-off-by: Sergio Castaño Arteaga <[email protected]>

src/build/data.rs

@@ -676,11 +676,11 @@ pub(crate) struct Repository {
 }
 
 lazy_static! {
-    static ref VALID_CHARS: Regex = Regex::new(r"[a-z0-9\-\ ]").expect("exprs in VALID_CHARS to be valid");
+    static ref VALID_CHARS: Regex = Regex::new(r"[a-z0-9\-\ \+]").expect("exprs in VALID_CHARS to be valid");
     static ref MULTIPLE_HYPHENS: Regex = Regex::new(r"-{2,}").expect("exprs in MULTIPLE_HYPHENS to be valid");
 }
 
-// Normalize category, subcategory and item name
+/// Normalize category, subcategory and item name.
 pub(crate) fn normalize_name(value: &str) -> String {
     let mut normalized_name = value
         .to_lowercase()