change required ownCloud version to 4.91

apps/files/appinfo/info.xml

@@ -5,7 +5,7 @@
 	<description>File Management</description>
 	<licence>AGPL</licence>
 	<author>Robin Appelman</author>
-	<require>4.9</require>
+	<require>4.91</require>
 	<shipped>true</shipped>
 	<standalone/>
 	<default_enable/>

apps/files_external/appinfo/info.xml

@@ -5,7 +5,7 @@
 	<description>Mount external storage sources</description>
 	<licence>AGPL</licence>
 	<author>Robin Appelman, Michael Gapczynski</author>
-	<require>4.9</require>
+	<require>4.91</require>
 	<shipped>true</shipped>
 	<types>
 		<filesystem/>

apps/files_sharing/appinfo/info.xml

@@ -5,7 +5,7 @@
 	<description>File sharing between users</description>
 	<licence>AGPL</licence>
 	<author>Michael Gapczynski</author>
-	<require>4.9</require>
+	<require>4.91</require>
 	<shipped>true</shipped>
 	<default_enable/>
 	<types>

apps/files_versions/appinfo/info.xml

@@ -4,7 +4,7 @@
 	<name>Versions</name>
 	<licence>AGPL</licence>
 	<author>Frank Karlitschek</author>
-	<require>4.9</require>
+	<require>4.91</require>
 	<shipped>true</shipped>
 	<description>Versioning of files</description>
 	<types>

apps/user_ldap/appinfo/info.xml

@@ -7,7 +7,7 @@
 	This app is not compatible to the WebDAV user backend.</description>
 	<licence>AGPL</licence>
 	<author>Dominik Schmidt and Arthur Schiwon</author>
-	<require>4.9</require>
+	<require>4.91</require>
 	<shipped>true</shipped>
 	<types>
 		<authentication/>

apps/user_webdavauth/appinfo/info.xml

@@ -7,7 +7,7 @@
 	This app is not compatible to the LDAP user and group backend.</description>
 	<licence>AGPL</licence>
 	<author>Frank Karlitschek</author>
-	<require>4.9</require>
+	<require>4.91</require>
 	<shipped>true</shipped>
 	<types>
 		<authentication/>