move gotd fork into repo. (#111)

- update to latest telegram layer
- remove some references to fields in tg.Entities that don't exist in
the schema
- originally added here:
https://github.com/beeper/td/commit/820929062a2ba0104397bc01235ab58a9cff780e
  - referenced here
-
https://github.com/mautrix/telegramgo/commit/124f0967ed195b5a380c9bd02e170ada9710dde3
-
https://github.com/mautrix/telegramgo/commit/4205047aab2e0639217148b5d125bfaab668bd8e

pkg/gotd/telegram/peers/invite_link_test.go

@@ -0,0 +1,33 @@
+package peers
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestInviteLinkGetters(t *testing.T) {
+	a := require.New(t)
+
+	testExported := testChatInviteExported()
+	replacer := testExported
+	replacer.Link += "/aboba"
+	link := InviteLink{
+		raw:       *testExported,
+		newInvite: *replacer,
+	}
+	a.Equal(testExported, link.Raw())
+	{
+		replacedWith, ok := link.ReplacedWith()
+		a.True(ok)
+		a.Equal(replacer, replacedWith.Raw())
+	}
+	a.Equal(testExported.Revoked, link.Revoked())
+	a.Equal(testExported.Permanent, link.Permanent())
+	a.Equal(testExported.RequestNeeded, link.RequestNeeded())
+	a.Equal(testExported.Link, link.Link())
+	{
+		date, _ := link.ExpireDate()
+		a.Equal(testExported.ExpireDate, int(date.Unix()))
+	}
+}