README: Update LLNL release number to Apache-2.0/MIT version (#44)

The release number in the README had not been updated since we did the relicense to Apache-2.0 OR MIT in v0.12.0. LLNL-CODE-811652 is Spack's new LLNL release number.
spack · Jun 16, 2020 · 653119a · 653119a
1 parent 20e398d
commit 653119a
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/README.md b/README.md
@@ -36,4 +36,4 @@ See [LICENSE-MIT](https://github.com/spack/spack/blob/develop/LICENSE-MIT),
 
 SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-LLNL-CODE-647188
+LLNL-CODE-811652