Update Galaxy meta and readme

Readme mostly formatting changes. Meta file now includes supported Ubuntu releases.

README.md

@@ -17,40 +17,40 @@ Technically this role has no requirements. If it's ran without any variables set
 Role Variables
 --------------
 
-#### zerotier_network_id
+### zerotier_network_id
 *Type*: string  
 *Default value*:   
 *Description*: The 16 character network ID of the network the new members should join. The node will not join any network if omitted.
 
-#### zerotier_member_register_short_hostname
+### zerotier_member_register_short_hostname
 *Type*: boolean  
 *Default value*: `false`  
-*Description*: Used to register the short hostname (without the FQDN) on the network instead of the long one.
+*Description*: By default `inventory_hostname` will be used to name a member in a network. If set to `true`, `inventory_hostname_short` will be used instead.
 
-#### zerotier_member_ip_assignments
+### zerotier_member_ip_assignments
 *Type*: list  
 *Default value*: `[]`    
 *Description*: A list of IP addresses to assign this member. The member will be automatically assigned an address on the network if left out.
 
-#### zerotier_member_description
+### zerotier_member_description
 *Type*: string  
-*Default value*:      
+*Default value*: `""`      
 *Description*: Optional desription for a member.
 
-#### zerotier_api_accesstoken
+### zerotier_api_accesstoken
 *Type*: string  
-*Default value*:   
+*Default value*: `""`   
 *Description*: The access token needed to authorize with the ZeroTier API. You can generate one in your account settings at https://my.zerotier.com/. If this is left out then the newly joined member will not be automatically authorized.
 
-#### zerotier_api_url
+### zerotier_api_url
 *Type*: string  
 *Default value*: `https://my.zerotier.com`  
 *Description*: The url where the Zerotier API lives. Must use HTTPS protocol.  
 
-#### zerotier_api_delegate
+### zerotier_api_delegate
 *Type*: string  
 *Default value*: `localhost`      
-*Description*: Option to delegate tasks for Zerotier API calls. By default the API calls are made from the machine running the role.
+*Description*: Option to delegate tasks for Zerotier API calls. This is usefull in a situation where API calls can only be made from a whitelisted management server, for example.
 
 Example Playbook
 ----------------

meta/main.yml

@@ -27,7 +27,7 @@ galaxy_info:
   # this branch. If Travis integration is configured, only notifications for this
   # branch will be accepted. Otherwise, in all cases, the repo's default branch
   # (usually master) will be used.
-  #github_branch:
+  github_branch: master
 
   #
   # platforms is a list of platforms, and each platform has a name and a list of versions.
@@ -39,6 +39,10 @@ galaxy_info:
   - name: Debian
     versions:
     - stretch
+  - name: Ubuntu
+    versions:
+    - Bionic
+    - Cosmic
   - name: Fedora
     versions:
     - 28