Fix typo in changelog for 1.3.0 (#1586)

The last release was in December 2019.
1.3.0 was released in January 2020, not 2019.

CHANGELOG.md

@@ -5,7 +5,7 @@
 * [1572](https://github.com/grafana/loki/pull/1572) **owen-d**: Introduces the `querier.query-ingesters-within` flag and associated yaml config. When enabled, queries for a time range that do not overlap this lookback interval will not be sent to the ingesters.
 * [1558](https://github.com/grafana/loki/pull/1558) **owen-d**: Introduces `ingester.max-chunk-age` which specifies the maximum chunk age before it's cut.
 
-## 1.3.0 (2019-01-16)
+## 1.3.0 (2020-01-16)
 
 ### What's New?? ###