update cron config in .drone.yml

.drone.yml

@@ -8,24 +8,21 @@ steps:
 - name: maven
   image: maven:3-jdk-10
   volumes:
-    - name: cache 
-      path: /root/.m2 
+  - name: cache
+    path: /root/.m2
   commands:
-    - mvn install -DskipTests=true
-
-- name: run 
-  image: maven:3-jdk-8 
+  - mvn install -DskipTests=true
+- name: run
+  image: maven:3-jdk-8
   volumes:
-    - name: cache 
-      path: /root/.m2 
-  commands: 
-    - nohup mvn tomcat7:run &
-
+  - name: cache
+    path: /root/.m2
+  commands:
+  - nohup mvn tomcat7:run &
 volumes:
-  - name: cache 
-    host:
-      path: /var/lib/cache
-
+- name: cache
+  host:
+    path: /var/lib/cache
 trigger:
   branch:
   - master