Fix wrong release type in 0.16.1 release note

Author: azuchi

_releases/0.16.1.md

@@ -29,7 +29,7 @@ Bitcoin Core version 0.16.1 is now available from:
 
   <https://bitcoincore.org/bin/bitcoin-core-0.16.1/>
 
-This is a new major version release, including new features, various bugfixes
+This is a new minor version release, including new features, various bugfixes
 and performance improvements, as well as updated translations.
 
 Please report bugs using the issue tracker at GitHub: