Add `is_active` attribute

Added

• Add an is_active attribute to the AppSignal client. It tells you whether AppSignal is configured to start, so you can use it to only run code that makes sense when AppSignal is active:

  Python

  from appsignal import Appsignal
   
  appsignal = Appsignal(name="My app name", push_api_key="my-push-api-key", active=True)
   
  if appsignal.is_active:
      # Only runs when AppSignal is active

  Before this change, the only way to check this was to read the client's private configuration object.

View the Python package v1.7.2 changelog for more information.