Fix molecule lint errors

Author: fapdash

defaults/main.yml

@@ -1,2 +1,2 @@
 ---
-letsencrypt_staging: no
+letsencrypt_staging: false

meta/main.yml

@@ -1,3 +1,4 @@
+---
 galaxy_info:
   author: coopdevs
   description: free software for Social and Solidarity Economy
@@ -8,11 +9,11 @@ galaxy_info:
   min_ansible_version: 1.2
 
   platforms:
-  - name: Ubuntu
-    versions:
-    - trusty
-    - xenial
-    - bionic
+    - name: Ubuntu
+      versions:
+        - trusty
+        - xenial
+        - bionic
 
   galaxy_tags:
     - certbot