Add APPSIGNAL_FILTER_SESSION_DATA env config (#409)
Add APPSIGNAL_FILTER_SESSION_DATA env config (#409)

Adds env var config option for `filter_session_data`.

Forgotten to add in #402.
appsignal/appsignal-ruby,matrinox/appsignal-ruby,appsignal/appsignal,appsignal/appsignal,appsignal/appsignal-ruby,appsignal/appsignal-ruby,matrinox/appsignal-ruby,matrinox/appsignal-ruby,appsignal/appsignal-ruby