Update meta, since Yunohost is only compatible with debian 8

meta/main.yml

@@ -5,39 +5,9 @@ galaxy_info:
   min_ansible_version: 1.2
   galaxy_tags: [yunohost]
   platforms:
-  - name: EL
-    versions:
-    - all
-  - name: GenericUNIX
-    versions:
-    - all
-  - name: Fedora
-    versions:
-    - all
-  - name: opensuse
-    versions:
-    - all
-  - name: Amazon
-    versions:
-    - all
-  - name: GenericBSD
-    versions:
-    - all
-  - name: FreeBSD
-    versions:
-    - all
-  - name: Ubuntu
-    versions:
-    - all
-  - name: SLES
-    versions:
-    - all
-  - name: GenericLinux
-    versions:
-    - all
   - name: Debian
     versions:
-    - all
+      - jessie
   categories:
     - cloud
     - web