README, switch from wikitext bullets to markdown

My linter was yelling at me

Change-Id: I70fb20b7e695f08d07ea8c4453a326b06b1a2e6c

README.md

@@ -29,5 +29,5 @@ Execute the binary from any directory with `~/go/src/gerrit.wikimedia.org/r/medi
 
 ## Support
 
-* Phabricator: [#MediaWiki-Docker](https://phabricator.wikimedia.org/project/view/4585/)
-* IRC: `#mediawiki`
+- Phabricator: [#MediaWiki-Docker](https://phabricator.wikimedia.org/project/view/4585/)
+- IRC: `#mediawiki`