lint yaml files

.yamllint

+---
+
+extends: default
+
+rules:
+  comments-indentation:
+    level: warning
+  document-start:
+    level: error
+  empty-lines:
+    max: 1
+  empty-values:
+    forbid-in-flow-mappings: true
+    forbid-in-block-mappings: true
+  line-length:
+    level: warning
+  octal-values:
+    forbid-implicit-octal: true
+    level: warning

unbound/handlers/main.yml

+---
+
 - name: restart unbound
   systemd: name=unbound.service state=restarted

unbound/tasks/main.yml

+---
+
 - name: Install unbound packages
   apt: name=unbound state=present
   tags: