bump version to 3.2.0 and drop 18 support

Signed-off-by: Arthur Schiwon <blizzz@arthur-schiwon.de>

.drone.yml

@@ -132,51 +132,3 @@ trigger:
         - push
 
 type: docker
----
-kind: pipeline
-name: tests-18
-
-clone:
-    depth: 1
-
-steps:
-    - name: php7.3-stable18
-      image: nextcloudci/php7.3:php7.3-5
-      environment:
-          APP_NAME: user_saml
-          CORE_BRANCH: stable18
-          DB: sqlite
-      commands:
-          - wget https://raw.githubusercontent.com/nextcloud/travis_ci/master/before_install.sh
-          - bash ./before_install.sh $APP_NAME $CORE_BRANCH $DB
-          - cd ../server/apps/$APP_NAME
-          - cd tests/unit/
-          - phpunit --configuration phpunit.xml
-
-    - name: integration-tests-stable18
-      image: nextcloudci/user_saml_shibboleth-php7.2:user_saml_shibboleth_php7.2-3
-      environment:
-          CORE_BRANCH: stable18
-      commands:
-          - /start.sh &
-          - sleep 7
-          - rm -rf /var/www/html
-          - cd /var/www/
-          - git clone --depth 1 -b $CORE_BRANCH https://github.com/nextcloud/server html
-          - cd /var/www/html && git submodule update --init
-          # use local clone
-          - cp -r /drone/src /var/www/html/apps/user_saml
-          - scl enable rh-php72 "bash -c 'php /var/www/html/occ maintenance:install --database sqlite --admin-pass password; php /var/www/html/occ app:enable user_saml'"
-          - chown -R apache:apache /var/www/html/
-          - scl enable rh-php72 "bash -c 'cd /var/www/html/apps/user_saml/tests/integration && vendor/bin/behat'"
-
-trigger:
-    branch:
-        - master
-    event:
-        - pull_request
-        - push
-
-type: docker
-
-

appinfo/info.xml

@@ -16,7 +16,7 @@ The following providers are supported and tested at the moment:
 	* Any other provider that authenticates using the environment variable
 
 While theoretically any other authentication provider implementing either one of those standards is compatible, we like to note that they are not part of any internal test matrix.]]></description>
-	<version>3.1.2</version>
+	<version>3.2.0</version>
 	<licence>agpl</licence>
 	<author>Lukas Reschke</author>
 	<namespace>User_SAML</namespace>
@@ -33,7 +33,7 @@ While theoretically any other authentication provider implementing either one of
 	<screenshot>https://raw.githubusercontent.com/nextcloud/user_saml/master/screenshots/1.png</screenshot>
 	<screenshot>https://raw.githubusercontent.com/nextcloud/user_saml/master/screenshots/2.png</screenshot>
 	<dependencies>
-		<nextcloud min-version="18" max-version="20" />
+		<nextcloud min-version="19" max-version="20" />
 	</dependencies>
 	<commands>
 		<command>OCA\User_SAML\Command\GetMetadata</command>