oauth2: add api.netatmo.net to the broken providers

The auth on Netatmo api need ClientSecret in post request.

Like descripted in github issue at
https://github.com/golang/oauth2/issues/111

Change-Id: Ia85120d231e8a5c0ec851ddc3557bad26ecad41d
Reviewed-on: https://go-review.googlesource.com/11833
Reviewed-by: Andrew Gerrand <adg@golang.org>
diff --git a/internal/token.go b/internal/token.go
index ea6716c..a17d79d 100644
--- a/internal/token.go
+++ b/internal/token.go
@@ -109,6 +109,7 @@
 	"https://app.box.com/",
 	"https://test-sandbox.auth.corp.google.com",
 	"https://user.gini.net/",
+	"https://api.netatmo.net/",
 }
 
 // providerAuthHeaderWorks reports whether the OAuth2 server identified by the tokenURL