releases: Fill in release date for 0.18.0

Author: laanwj

_posts/en/posts/2019-05-01-release-0.18.0.md renamed to _posts/en/posts/2019-05-02-release-0.18.0.md

@@ -4,7 +4,7 @@ id: en-release-0.18.0
 name: release-0.18.0
 permalink: /en/releases/0.18.0/
 excerpt: Bitcoin Core version 0.18.0 is now available
-date: 2018-05-01
+date: 2018-05-02
 
 ## Use a YAML array for the version number to allow other parts of the
 ## site to correctly sort in "natural sort of version numbers"