Add additional instructions for 1.0.12 removal and update configuration info
Add additional instructions for 1.0.12 removal and update configuration info

NewRelic-Python-Plugins/newrelic-python-agent,NewRelic-Python-Plugins/newrelic-python-agent,alonisser/newrelic-plugin-agent,notnmeyer/newrelic-plugin-agent,NewRelic-Python-Plugins/newrelic-python-agent,whiteear/newrelic-plugin-agent,rounds/newrelic-plugin-agent,ModusCreateOrg/newrelic-plugin-agent,whiteear/newrelic-plugin-agent,ModusCreateOrg/newrelic-plugin-agent,MeetMe/newrelic-plugin-agent,alonisser/newrelic-plugin-agent,ModusCreateOrg/newrelic-plugin-agent,rounds/newrelic-plugin-agent,notnmeyer/newrelic-plugin-agent,notnmeyer/newrelic-plugin-agent,rounds/newrelic-plugin-agent,MeetMe/newrelic-plugin-agent,whiteear/newrelic-plugin-agent,MeetMe/newrelic-plugin-agent,alonisser/newrelic-plugin-agent