README.md in countries-5.6.0 vs README.md in countries-5.7.0

@@ -229,9 +229,15 @@
 ```ruby
 c = Country['MY']
 c.emoji_flag # => "🇲🇾"
 ```
 
+### Country Distance Unit (miles/kilometres)
+
+```ruby
+c.distance_unit # => "MI"
+```
+
 ### Plucking multiple attributes
 
 ```ruby
 ISO3166::Country.pluck(:alpha2, :iso_short_name) # => [["AD", "Andorra"], ["AE", "United Arab Emirates"], ...
 ```