Prepare for release of 3.0 alpha 15

Reviewed-by: NTomas Mraz <tomas@openssl.org>

CHANGES.md

@@ -21,7 +21,7 @@ OpenSSL Releases
 OpenSSL 3.0
 -----------
 
-### Changes between 1.1.1 and 3.0 [xx XXX xxxx]
+### Changes between 1.1.1 and 3.0 alpha 15 [22 Apr 2021]
 
  * The default manual page suffix ($MANSUFFIX) has been changed to "ossl"
 

NEWS.md

@@ -18,7 +18,7 @@ OpenSSL Releases
 OpenSSL 3.0
 -----------
 
-### Major changes between OpenSSL 1.1.1 and OpenSSL 3.0 [under development]
+### Major changes between OpenSSL 1.1.1 and OpenSSL 3.0 alpha 15 [in pre-release]
 
   * Added suport for Kernel TLS (KTLS)
   * Changed the license to the Apache License v2.0.

VERSION.dat

 MAJOR=3
 MINOR=0
 PATCH=0
-PRE_RELEASE_TAG=alpha15-dev
+PRE_RELEASE_TAG=alpha15
 BUILD_METADATA=
-RELEASE_DATE=""
+RELEASE_DATE="22 Apr 2021"
 SHLIB_VERSION=3