fix [[wikilink]] detection regex

src/main.rs

@@ -399,7 +399,7 @@ impl<'a> Iterator for GardenParser<'a> {
 }
 
 fn preprocess_markdown(string: String) -> String {
-    let double_brackets = Regex::new(r"\[\[(?P<inner>[\w .]+)\]\]").unwrap();
+    let double_brackets = Regex::new(r"\[\[(?P<inner>[\w\- .]+)\]\]").unwrap();
     let finder = LinkFinder::new();
 
     let result = double_brackets