Add Dutch translation for invalid number

README.md

@@ -105,7 +105,7 @@ validates_plausible_phone :phone_number, without: /^\+\d+/
 validates_plausible_phone :phone_number, presence: true, with: /^\+\d+/
 ```
 
-the i18n key is `:improbable_phone`. Languages supported by default: de, en, fr, it, ja, kh, tr, ua and ru.
+the i18n key is `:improbable_phone`. Languages supported by default: de, en, fr, it, ja, kh, nl, tr, ua and ru.
 
 You can also validate if a number has the correct country number:
 

lib/phony_rails/locales/nl.yml

@@ -0,0 +1,4 @@
+nl:
+  errors:
+    messages:
+      improbable_phone: "is geen geldig nummer"

spec/lib/validators/phony_validator_spec.rb

@@ -157,6 +157,14 @@ class MismatchedHelpfulHome < ActiveRecord::Base
       expect(@home.errors.messages).to include(phone_number: ["is an invalid number"])
     end
 
+    it "should translate the error message in Dutch" do
+      I18n.with_locale(:nl) do
+        @home.phone_number = INVALID_NUMBER
+        @home.valid?
+        expect(@home.errors.messages).to include(phone_number: ["is geen geldig nummer"])
+      end
+    end
+
     it "should translate the error message in English" do
       I18n.with_locale(:en) do
         @home.phone_number = INVALID_NUMBER