Add strong typing for 3.0 version

src/Field/InputEmailField.php

+<?php
+
+namespace WPDesk\Forms\Field;
+
+use WPDesk\Forms\Sanitizer;
+use WPDesk\Forms\Sanitizer\EmailSanitizer;
+
+class InputEmailField extends BasicField {
+
+	public function get_type(): string {
+		return 'email';
+	}
+
+	public function get_sanitizer(): Sanitizer {
+		return new EmailSanitizer();
+	}
+
+	public function get_template_name(): string {
+		return 'input-text';
+	}
+}