Upgrade riot version

src/freedombone-app-riot

@@ -32,7 +32,7 @@ IN_DEFAULT_INSTALL=0
 SHOW_ON_ABOUT=1
 NOT_ON_ONION=1
 
-RIOT_VERSION='0.13.3'
+RIOT_VERSION='0.15.3'
 RIOT_FILENAME="riot-v${RIOT_VERSION}"
 RIOT_HASH='bcd6c2f4be018612ac76a71b58749a5edab1e02de7d145a22d9b9aa6e6a89129'
 RIOT_DOWNLOAD_URL="https://github.com/vector-im/riot-web/releases/download/v${RIOT_VERSION}"