New features:

• it is now possible to register as a slave and subscribe to a binlog event stream (see Conn::get_binlog_stream and this test)
• mysql_old_password plugin support was added (see OptsBuilder::secure_auth)
• new options for client side max_allowed_packet and wait_timeout was added (see #151)
• new FromRow implementation was added for frunk::HList. This allows to perform row-to-tuple conversion for tuples of arbitrary arity (using HCons::into_tuple2)

Improvements:

• binary serialization/deserialization was improved (up to 5% speedup)

Other:

• add Conn::last_ok_packet
• migrate from crate::BoxFuture to futures_core::future::BoxFuture
• documentation fixes (by @yerke)
• fix #155