Added the new field provider_data to sendInvoice for sharing information about the invoice with the payment provider

Author: pengrad

library/src/main/java/com/pengrad/telegrambot/request/SendInvoice.java

@@ -15,6 +15,10 @@ public SendInvoice(Integer chatId, String title, String description, String payl
                 .add("start_parameter", startParameter).add("currency", currency).add("prices", serialize(prices));
     }
 
+    public SendInvoice providerData(String providerData) {
+        return add("provider_data", providerData);
+    }
+
     public SendInvoice photoUrl(String photoUrl) {
         return add("photo_url", photoUrl);
     }

library/src/test/java/com/pengrad/telegrambot/TelegramBotTest.java

@@ -718,6 +718,7 @@ public void sendVideoNoteFile() throws IOException {
     public void sendInvoice() {
         SendResponse response = bot.execute(new SendInvoice(chatId, "title", "desc", "my_payload",
                 "284685063:TEST:NThlNWQ3NDk0ZDQ5", "my_start_param", "USD", new LabeledPrice("label", 200))
+                .providerData("{\"foo\" : \"bar\"}")
                 .photoUrl("https://telegram.org/img/t_logo.png").photoSize(100).photoHeight(100).photoWidth(100)
                 .needPhoneNumber(true).needShippingAddress(true).needEmail(true).needName(true)
                 .isFlexible(true)