oauth2: add user.gini.net to the broken providers

Change-Id: I4fa586bec82309bad4dbb02ae6b722f9c19608f6
Reviewed-on: https://go-review.googlesource.com/9804
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/internal/token.go b/internal/token.go
index 727d957..ea6716c 100644
--- a/internal/token.go
+++ b/internal/token.go
@@ -108,6 +108,7 @@
 	"https://www.strava.com/oauth/",
 	"https://app.box.com/",
 	"https://test-sandbox.auth.corp.google.com",
+	"https://user.gini.net/",
 }
 
 // providerAuthHeaderWorks reports whether the OAuth2 server identified by the tokenURL