README.md: fix link to service providers

Author: alanorth

README.md

@@ -552,7 +552,7 @@ Additional support options are at https://wiki.lyrasis.org/display/DSPACE/Suppor
 
 DSpace also has an active service provider network. If you'd rather hire a service provider to
 install, upgrade, customize or host DSpace, then we recommend getting in touch with one of our
-[Registered Service Providers](https://www.dspace.org/service-providers).
+[Registered Service Providers](https://dspace.org/registered-service-providers/).
 
 
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