Adds checksum for 1.2-alpha

Author: jmvalin

releases.sha2

@@ -28,6 +28,7 @@ b9727015a58affcf3db527322bf8c4d2fcf39f5f6b8f15dbceca20206cbe1d95  opus-1.1.tar.g
 9b84ff56bd7720d5554103c557664efac2b8b18acc4bbcc234cb881ab9a3371e  opus-1.1.1.tar.gz
 0e290078e31211baa7b5886bcc8ab6bc048b9fc83882532da4a1a45e58e907fd  opus-1.1.2.tar.gz
 58b6fe802e7e30182e95d0cde890c0ace40b6f125cffc50635f0ad2eef69b633  opus-1.1.3.tar.gz
+654a9bebb73266271a28edcfff431e4cfd9bfcde71f42849a0cdd73bece803a7  opus-1.2-alpha.tar.gz
 94ac78ca4f74c4e43bc9fe4ec1ad0aa36f38ab90f45b0727c40dd1e96096e767  opus_testvectors-draft11.tar.gz
 94ac78ca4f74c4e43bc9fe4ec1ad0aa36f38ab90f45b0727c40dd1e96096e767  opus_testvectors.tar.gz
 5d2b99757bcb628bab2611f3ed27af6f35276ce3abc96c0ed4399d6c6463dda5  opus-tools-0.1.2.tar.gz