0.5.0

Breaking changes:

• Client::default is now implemented via std::default::Default, which requires importing the trait.
• Client::new now takes a slice of URLs instead of one URL.
• Client::self_stats, Client::store_stats, and Client::version now return a vector of results—one for each etcd member the client was initialized with. Additionally, Client::version has been renamed to Client::versions to make this more clear.
• The Etcd variant of etcd::error::Error has been renamed Api and its contained type, EtcdError, has been renamed ApiError.
• Two new variants have been added to etcd::error::Error: InvalidUrl and NoEndpoints. See the API docs for their purposes.
• KeySpaceResult's error type is now a vector of errors, to account for the client supporting multiple etcd members now.
• The node field of the KeySpaceInfo struct is now wrapped in an Option.
• The client, error, and keys modules are no longer public. All their user-facing public types are available from the crate root.
• The fields of the CountStats, FollowerStats, LatencyStats, and VersionInfo structs are no longer wrapped in Options.

New features:

• Client now accepts multiple URLs for etcd members. Except for API calls that specifically target a member, each API call will try each member in sequence, returning the first successful result. If all members are exhausted without a successful response, the client will return a vector of errors—one for each member it tried.
• A new constructor, Client::with_options, takes the new ClientOptions struct as an argument and provides support for three new features:
  1. Using a custom certificate authority for HTTPS connections.
  2. Authenticating with the etcd server(s) using client certificates for HTTPS connections.
  3. Authenticating with the etcd server(s) using a username and password for the auth API introduced in etcd 2.2.
• etcd::error::Error and etcd::error::ApiError now implement std::error::Error.

Improvements:

• Examples of usage have been added to the crate root documentation.
• Various improvements to API documentation.