added a note of libravatar shutting down to the README of the addon

diff --git a/libravatar/README.md b/libravatar/README.md
index 07ac2a798309b384379e5e234762b6675bc43713..d535aa071be13b73f84a78e96fbe4025b7fa201b 100644 (file)
--- a/libravatar/README.md
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@@ -1,6 +1,9 @@
 # Libravatar Addon
 by [Klaus Weidenbach](http://friendica.dszdw.net/profile/klaus)
 
+**Please note that [the Libravatar service will shut down on 2018-09-01:](https://blog.libravatar.org/posts/Libravatar.org_is_shutting_down_on_2018-09-01/).**
+You maybe want to switch to the catavatar or gravatar addon.
+
 This addon allows you to look up an avatar image for new users and contacts at [Libravatar](http://www.libravatar.com). It will be used if there have not been found any other avatar images yet for example through OpenID.
 
 Libravatar is a free and open replacement for Gravatar. It is a service where people can store an avatar image for their email-addresses. These avatar images can get looked up for example in comment functions, profile pages, etc. on other sites. There exists a central installation at [www.libravatar.com](http://www.libravatar.com), but you can also host it on your own server. If no avatar was found Libravatar will look up at Gravatar as a fallback.