Update Drone CI config

.drone.yml

@@ -1,38 +1,24 @@
+kind: pipeline
+name: default
+
 clone:
-  git:
-    image: plugins/git
-    depth: 1
+  disable: true
+
+steps:
+- name: clone
+  image: plugins/git
+  settings:
+    depth: 10
     skip_verify: true
-
-pipeline:
-  restore-cache:
-    image: drillster/drone-volume-cache
-    restore: true
-    mount:
-      - vendor
-    volumes:
-      - /var/lib/drone/cache:/cache
-    cache_key: [ DRONE_REPO_OWNER, DRONE_REPO_NAME, DRONE_BRANCH ]
-
-  pre-build:
-    image: composer
-    commands:
-      - composer install
-  test:
-    image: composer
-    commands:
-      - ./vendor/bin/robo test
-
-  test-style:
-    image: composer
-    commands:
-      - ./vendor/bin/robo test:cs
-
-  rebuild-cache:
-    image: drillster/drone-volume-cache
-    rebuild: true
-    mount:
-      - vendor
-    volumes:
-      - /var/lib/drone/cache:/cache
-    cache_key: [ DRONE_REPO_OWNER, DRONE_REPO_NAME, DRONE_BRANCH ]
+- name: pre-build
+  image: composer
+  commands:
+  - composer install
+- name: test
+  image: composer
+  commands:
+  - ./vendor/bin/robo test
+- name: test-style
+  image: composer
+  commands:
+  - ./vendor/bin/robo test:cs