README.md: replace links to http://www.dspace.org

Author: alanorth

README.md

@@ -10,7 +10,7 @@ Overview
 
 DSpace open source software is a turnkey repository application used by more than
 2,000 organizations and institutions worldwide to provide durable access to digital resources.
-For more information, visit http://www.dspace.org/
+For more information, visit https://www.dspace.org/
 
 DSpace consists of both a Java-based backend and an Angular-based frontend.
 
@@ -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](http://www.dspace.org/service-providers).
+[Registered Service Providers](https://www.dspace.org/service-providers).
 
 
 Issue Tracker
@@ -565,7 +565,7 @@ DSpace uses GitHub to track issues:
 License
 -------
 DSpace source code is freely available under a standard [BSD 3-Clause license](https://opensource.org/licenses/BSD-3-Clause).
-The full license is available in the [LICENSE](LICENSE) file or online at http://www.dspace.org/license/
+The full license is available in the [LICENSE](LICENSE) file or online at https://www.dspace.org/license/
 
 DSpace uses third-party libraries which may be distributed under different licenses. Those licenses are listed
 in the [LICENSES_THIRD_PARTY](LICENSES_THIRD_PARTY) file.