Releases 0.17: fix typo

Reported by e4xit on Freenode IRC.

Author: harding

_posts/en/posts/2018-10-02-release-0.17.0.md

@@ -11,7 +11,7 @@ share: true
 version: 1
 
 excerpt: >
-  We're pleased the release of Bitcoin Core 0.17, a major new version
+  We're pleased to announce the release of Bitcoin Core 0.17, a major new version
   containing many new features as well as bug fixes and other
   improvements.
 ---