fix yml syntax

.gitlab-ci.yml

@@ -1,7 +1,12 @@
-deploy: // You can name your task however you like
+---
-    stage: deploy
+stages:
+    - deploy
+Upload to webserver:
+    stage deploy:
     only:
         - master
-        deploy:
     script:
-    - lftp -c "set ftp:ssl-allow no; open -u $USERNAME,$PASSWORD $HOST; mirror -Rev ./ ./  --ignore-time --parallel=10 --exclude-glob .git* --exclude .git/"
+        - |
+            lftp -c "set ftp:ssl-allow no; open -u $USERNAME,$PASSWORD $HOST; \
+            mirror -Rev ./ ./  --ignore-time --parallel=10 \
+            --exclude-glob .git* --exclude .git/"