update drone syntax for 1.x

.drone.yml

@@ -1,9 +1,23 @@
 ---
-pipeline:
-  build:
-    privileged: true
-    image: rancher/dapper:1.11.2
-    volumes:
-    - /var/run/docker.sock:/var/run/docker.sock
-    commands:
-    - dapper ci
+kind: pipeline
+name: default
+
+platform:
+  os: linux
+  arch: amd64
+
+steps:
+- name: build
+  pull: default
+  image: rancher/dapper:1.11.2
+  commands:
+  - dapper ci
+  privileged: true
+  volumes:
+  - name: socket
+    path: /var/run/docker.sock
+
+volumes:
+- name: socket
+  host:
+    path: /var/run/docker.sock