RevNews: add missing comma

All the other items have one.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

rev_news/drafts/edition-45.md

@@ -271,7 +271,7 @@ This edition covers what happened during the month of October 2018.
 
 ## Releases
 
-+ StGit [0.19](https://public-inbox.org/git/1541522776.3963181.1567641696.46EFA2E6@webmail.messagingengine.com)
++ StGit [0.19](https://public-inbox.org/git/1541522776.3963181.1567641696.46EFA2E6@webmail.messagingengine.com),
 + libgit2 [0.27.7](https://github.com/libgit2/libgit2/releases/tag/v0.27.7),
 [0.27.6](https://github.com/libgit2/libgit2/releases/tag/v0.27.6)
 + GitHub Enterprise [2.15.2](https://enterprise.github.com/releases/2.15.2/notes),