Version 0.10.0: Async/Await!

• Updated to use Stream trait from futures v0.3 (7941356)
• Renamed TwitterStreamBuilder type to Builder (fc91c28)
• Introduced Builder::new constructor that automatically determines the API endpoint to use (d117841)
• Builder::listen_with_client now takes an impl tower_service::Service (38a8f72)
• Use newly introduced BoundingBox type for locations parameter (af5513e)
• Use Cow<_>s for possibly borrowed parameters of Builder, so that you can create an "owned" Builder more easily (2b6584b)
• Replaced the (defective) TwitterStream::filter constructor with TwitterStream::{follow,track,locations} constructors (2b59ad6, 022b13f)
• Removed Builder::method and made Builder::endpoint take an HTTP request method (a00aace)
• Renamed crate::types module to builder (56c76a6)
• Moved builder::StatusCode to error module (a5bc6dd)
• Removed FilterLevel::Custom variant (d4221de)
• Removed Error::Custom variant (1a2567f)
• Removed crate::rt module (42c4c5f)
• Changed structure of Token type and removed serde support (630e2a3. See examples/echo_bot.rs for an alternative)
• Removed native support for timeout (c034f76. See examples/timeout.rs for an alternative)
• Removed egg-mode and tweetust features (4d50fbb)