Update the current stable releases in homepage

Signed-off-by: Emanuele Aina <emanuele.aina@collabora.com>

content/_index.md

@@ -54,8 +54,8 @@ For more information, see [Release flow and product lines]( {{< ref "release-flo
 
 ## Further Links
 
-* Current stable release: [v2020.1]( {{< ref "/release/v2020.1/releasenotes.md" >}} )
-* Current old stable release: [v2019.3]( {{< ref "/release/v2019.3/releasenotes.md" >}} )
+* Current stable release: [v2020.2]( {{< ref "/release/v2020.2/releasenotes.md" >}} )
+* Current old stable release: [v2019.4]( {{< ref "/release/v2019.4/releasenotes.md" >}} )
 * Current development release: [v2021dev3]( {{< ref "/release/v2021dev3/releasenotes.md" >}} )
 * [Further releases]( {{< ref "releases.md" >}} )