Added Debian support to meta file

Also removed "yum repo" from readme to reflect multi platform support.

meta/main.yml

@@ -36,6 +36,9 @@ galaxy_info:
   - name: EL
     versions:
     - 7
+  - name: Debian
+    versions:
+    - all
   # - name: Fedora
   #   versions:
   #   - all
@@ -49,7 +52,6 @@ galaxy_info:
 
   galaxy_tags:
   - zerotier-one
-  - CentOS 7
     # List tags for your role here, one per line. A tag is a keyword that describes
     # and categorizes the role. Users find roles by searching for tags. Be sure to
     # remove the '[]' above, if you add tags to this list.