Allow for dashes in attribute parameter names

Example:
<a href="https://www.google.com" my-custom-data="someinterestinginformation">

The current regex pattern would parse the name of the second parameter as "data". The new regex also allows for dashes in the name and would extract the full parameter name "my-custom-data".

Sources/SwiftRichString/Style/StyleGroup.swift

@@ -86,7 +86,7 @@ public class StyleGroup: StyleProtocol {
 		private func extractParametersFromTags(_ string: String) -> [String: String]? {
 			guard let _ = string.firstIndex(of: " ") else { return nil } // no tags
 
-			let pattern = "\\w*\\s*=\\s*\"?\\s*([^\"][^\"]*)\\s*\"?.*?" // maybe shorter?
+			let pattern = "[\\w-]*\\s*=\\s*\"?\\s*([^\"][^\"]*)\\s*\"?.*?" // maybe shorter?
 			guard let regex = try? NSRegularExpression(pattern: pattern, options: .dotMatchesLineSeparators) else {
 				return nil
 			}