Attempt to fix yaml syntax in drone config

git-svn-id: http://svn.osgeo.org/postgis/trunk@15858 b70326c6-7e19-0410-871a-916f4a2858ee

Author: strk

.drone.yml

@@ -21,5 +21,5 @@ pipeline:
       - service postgresql start
       - make check RUNTESTFLAGS=-v
       - make install
-      - utils/check_all_upgrades.sh \
+      - utils/check_all_upgrades.sh
         `grep '^POSTGIS_' Version.config | cut -d= -f2 | paste -sd '.'`