Update for 2018-11 snapshot

Author: dstebila

RELEASE.md

@@ -20,8 +20,7 @@ This branch of our fork of OpenSSL can be used with the following versions of li
 Release notes
 =============
 
-**This is a release candidate for liboqs master, not a final release.**.
-This snapshot of the OQS fork of OpenSSL 1.1.1 (OQS-OpenSSL_1\_1\_1-stable) was released on TODO.  Its release page on Github is TODO.
+This snapshot of the OQS fork of OpenSSL 1.1.1 (`OQS-OpenSSL_1_1_1-stable`) was released on November 13, 2018.  Its release page on Github is https://github.com/open-quantum-safe/openssl/releases/tag/OQS-OpenSSL_1_1_1-stable-snapshot-2018-11.
 
 What's New
 ----------