Changes

Changed

• Update actix-connect and actix-tls dependency to 2.0.0-alpha.1. #1395

• Change default initial window size and connection window size for HTTP2 to 2MB and 1MB respectively
  to improve download speed for awc when downloading large objects. #1394

• client::Connector accepts initial_window_size and initial_connection_window_size HTTP2 configuration. #1394

• client::Connector allowing to set max_http_version to limit HTTP version to be used. #1394