Simplify regex and support any amount of version identifiers

Author: rastating

lib/wpxf/wordpress/fingerprint.rb

@@ -62,7 +62,7 @@ def check_plugin_version_from_readme(name, fixed = nil, introduced = nil)
   # @return [Symbol] :unknown, :vulnerable or :safe.
   def check_plugin_version_from_changelog(plugin_name, file_name, fixed = nil, introduced = nil)
     changelog = normalize_uri(wordpress_url_plugins, plugin_name, file_name)
-    check_version_from_custom_file(changelog, /=\s(\d\.\d(\.\d)?)\s=/, fixed, introduced)
+    check_version_from_custom_file(changelog, /=\s([\d\.]+)\s=/, fixed, introduced)
   end
 
   # Checks a custom file for a vulnerable version.