Merge pull request #490 from prometheus/grobie/fix-stable-list-header

Fix stable/unstable list headers in 1.0 post

content/blog/2016-07-18-prometheus-1-0-released.md

@@ -22,7 +22,8 @@ We’re confident Prometheus 1.0 is a solid monitoring solution. Now that the Pr
 So what does API stability mean? Prometheus has a large surface area and some parts are certainly more mature than others.
 There are two simple categories, _stable_ and _unstable_:
 
-* Stable as of v1.0 and throughout the 1.x series:
+Stable as of v1.0 and throughout the 1.x series:
+
 * The query language and data model
 * Alerting and recording rules
 * The ingestion exposition formats