Introscope Agent Version

This change updates the Introscope Agent Version to 20.+ for the latest
versions of the dependency.

[resolves #787]

Signed-off-by: Ben Hale <[email protected]>

Author: jy2697

config/introscope_agent.yml

@@ -15,6 +15,6 @@
 
 # Configuration for the CA Wily framework
 ---
-version: 11.+
+version: 20.+
 repository_root: https://ca.bintray.com/apm-agents
 default_agent_name: $(jq -r -n "$VCAP_APPLICATION | .application_name")