Allow Nextcloud 20

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

.travis.yml

@@ -32,6 +32,8 @@ matrix:
       env: "PHP_COVERAGE=TRUE"
     - php: 7.3
       env: "CORE_BRANCH=stable18"
+    - php: 7.4
+      env: "CORE_BRANCH=stable19"
     - php: nightly
       env: "DB=sqlite PATCH_VERSION_CHECK=TRUE"
   fast_finish: true

appinfo/info.xml

@@ -31,7 +31,7 @@
 	<screenshot>https://user-images.githubusercontent.com/1374172/79554966-278e1600-809f-11ea-82ea-7a0d72a2704f.png</screenshot>
 	<dependencies>
 		<php min-version="7.2" max-version="7.4" />
-		<nextcloud min-version="18" max-version="19" />
+		<nextcloud min-version="18" max-version="20" />
 	</dependencies>
 	<repair-steps>
 		<post-migration>