v3.0.0

• Added functions: ignore_exceptions, filter_keys, set_proxy, on_before_send
• Added support for local variables, global variables, and environment variables
• Added CLI for testing provider
• Py2: Added web middleware (Django, Flask and WSGI)
• Py2: Added send_exception function (see below)
• send() deprecated in favor of send_exception(); see the Sending Functions in the readme for the available options