resume Session
Resumes a session which has previously been paused, or starts a new session if none exists. If a session has already been resumed or started and has not been paused, calling this method will have no effect. You should disable automatic session tracking via setAutoTrackSessions if you call this method.
It's important to note that sessions are stored in memory for the lifetime of the application process and are not persisted on disk. Therefore calling this method on app startup would start a new session, rather than continuing any previous session. You should call this at the appropriate time in your application when you wish to resume a previously started session. Any subsequent errors which occur in your application will still be reported to Bugsnag but will not count towards your application's stability score.Return
true if a previous session was resumed, false if a new session was started.