Release agent 12.20.0 and 0.3 release prep (#354)

Author: mavimo

roles/agent_install/defaults/main.yml

@@ -1,6 +1,6 @@
 ---
 # defaults file for ansible-sysdig
-role_version: 0.0.1
+role_version: 0.3.0
 
 features:
   monitoring:
@@ -37,7 +37,7 @@ configuration:
       location: null
       install_build_dependencies: false
     override: null
-    version: 12.19.0
+    version: 12.20.0
   repository:
     deb:
       url: null