Error handling. Vendoring

Signed-off-by: Ettore Dreucci <ettore.dreucci@gmail.com>

vendor/gopkg.in/tucnak/telebot.v2/editable.go

@@ -0,0 +1,30 @@
+package telebot
+
+// Editable is an interface for all objects that
+// provide "message signature", a pair of 32-bit
+// message ID and 64-bit chat ID, both required
+// for edit operations.
+//
+// Use case: DB model struct for messages to-be
+// edited with, say two collums: msg_id,chat_id
+// could easily implement MessageSig() making
+// instances of stored messages editable.
+type Editable interface {
+	// MessageSig is a "message signature".
+	//
+	// For inline messages, return chatID = 0.
+	MessageSig() (messageID string, chatID int64)
+}
+
+// StoredMessage is an example struct suitable for being
+// stored in the database as-is or being embedded into
+// a larger struct, which is often the case (you might
+// want to store some metadata alongside, or might not.)
+type StoredMessage struct {
+	MessageID string `sql:"message_id" json:"message_id"`
+	ChatID    int64  `sql:"chat_id" json:"chat_id"`
+}
+
+func (x StoredMessage) MessageSig() (string, int64) {
+	return x.MessageID, x.ChatID
+}