Remove italic marks

Fixes #30

Author: mcornella

src/extension.ts

@@ -378,6 +378,7 @@ class MarkdownTocTools {
             title = title.replace(/\[(.+)]\([^)]*\)/gi, "$1");       // replace link
             title = title.replace(/<!--.+-->/gi, "");                // replace comment
             title = title.replace(/\#*/gi, "").trim();               // replace special char
+            title = title.replace(/\b_|_\b/gi, "");                  // replace italic marks
 
             if (!(title in hashMap)) {
                 hashMap[title] = 0;