Sign drone config file

View docs for more info on signing: https://docs.drone.io/signature/

.drone.yml

@@ -57,4 +57,10 @@ trigger:
     - master
   event:
     exclude:
-      - pull_request
+      - pull_request
+
+---
+kind: signature
+hmac: 08793426ddd2274e2de166144dc15cd63fe6a2c0fd47382d28f20ececee84898
+
+...