round the pretty file size

lib/colorls/core.rb

@@ -280,11 +280,21 @@ def chars_for_size
     end
 
     def justify_size_info(size)
-      size_num = size[0][0..-4].rjust(chars_for_size, ' ')
+      size_num = displayable_size_num(size[0]).rjust(chars_for_size, ' ')
       size_unit = @show_human_readable_size ? size[1].ljust(3, ' ') : size[1]
       "#{size_num} #{size_unit}"
     end
 
+    def displayable_size_num(size_num_str)
+      digit_after_decimal = size_num_str[-2]
+      if %w[5 6 7 8 9].include?(digit_after_decimal)
+        num = size_num_str.to_i
+        return (num + 1).to_s
+      end
+
+      size_num_str[0..-4]
+    end
+
     def clear_chars_for_size
       @chars_for_size = nil
     end