fix basefield lint

Author: sebastianMindee

lib/mindee/parsing/standard/base_field.rb

@@ -98,7 +98,7 @@ def format_for_display(in_str, max_col_size = nil)
           return '' if in_str.nil?
           return in_str if max_col_size.nil?
 
-          in_str = in_str.gsub(/[\n\r\t]/, "\n" => '\\n', "\r" => '\\r', "\t" => '\\t')
+          in_str = in_str.gsub(%r{[\n\r\t]}, "\n" => '\\n', "\r" => '\\r', "\t" => '\\t')
           in_str.length <= max_col_size ? in_str : "#{in_str[0..max_col_size - 4]}..."
         end
       end