add i18next.options to interface

i18next/i18next-tests.ts

@@ -60,5 +60,7 @@ i18n.t('helloWorld', <i18n.TranslationOptions> {
     defaultValue: 'default',
     count: 10
 });
+
+const options:i18n.Options = i18n.options;
 const currentLanguage:string = i18n.language;
 const userLanguageCodes:string[] = i18n.languages;

i18next/index.d.ts

@@ -119,6 +119,8 @@ declare namespace i18n {
         createInstance(options?:Options, callback?:(err:any, t:TranslationFunction) => void):I18n;
 
         cloneInstance(options?:Options, callback?:(err:any, t:TranslationFunction) => void):I18n;
+
+        options: Options;
     }
 }