Update drone config

.drone.yml

@@ -2,20 +2,15 @@ pipeline:
   clone:
     image: plugins/git
     depth: 1
-  signed-off-check:
-    image: nextcloudci/php7.0:php7.0-2
-    environment:
-      - APP_NAME=passman
-      - CORE_BRANCH=master
-      - DB=sqlite
+  verified-check:
+    image: python
     commands:
-      - wget https://raw.githubusercontent.com/nextcloud/travis_ci/master/before_install.sh
-      - bash ./before_install.sh $APP_NAME $CORE_BRANCH $DB
-      - cd ../server
-      - php ./build/signed-off-checker.php
+      - wget https://raw.githubusercontent.com/brantje/passman-ci/master/verified-check.py
+      - pip install requests
+      - python ./verified-check.py
     when:
       matrix:
-        TESTS: signed-off-check
+        TESTS: verified-check
 matrix:
   include:
-    - TESTS: signed-off-check
+    - TESTS: verified-check