Update default bold filter to disallow impersonation

channel.js

@@ -57,7 +57,7 @@ var Channel = function(name) {
     };
     this.filters = [
         new Filter("monospace", "`([^`]+)`", "g", "<code>$1</code>"),
-        new Filter("bold", "\\*([^\\*]+)\\*", "g", "<strong>$1</strong>"),
+        new Filter("bold", "(.)\\*([^\\*]+)\\*", "g", "$1<strong>$2</strong>"),
         new Filter("italic", "(^| )_([^_]+)_", "g", "$1<em>$2</em>"),
         new Filter("inline spoiler", "\\[spoiler\\](.*)\\[\\/spoiler\\]", "ig", "<span class=\"spoiler\">$1</span>")
     ];