Bump version. (tomusdrw#231)

Add std::error::Error impls (tomusdrw#217)

* Add std::error::Error impls

* Use source instead of cause.

* Fix warning.

Bump version. (tomusdrw#202)

Bumped version to 0.5.1 (tomusdrw#174)

* Updated a dependency

* Bumped version to 0.5.1

Add `traces` namespace (tomusdrw#148)

* Add `traces` namespace

basic code for traces namespace and types

tests for traces and trace_filtering types
builder for Trace Filter

tests for `traces` namespace and traces types (traces + trace_filtering)

move ValueOrArray back

* Add `traces` namespace

basic code for traces namespace and types

tests for traces and trace_filtering types
builder for Trace Filter

tests for `traces` namespace and traces types (traces + trace_filtering)

* fix return type of `trace_get`

* Fix types for Addresses
Some addresses were usize, some were H160.
This changes all addresses in `traces` to be `Address`

* make blockNumber and blockHash optional in TransactionReceipt (tomusdrw#164)

* Derive Eq and Hash for Bytes (tomusdrw#168)

This just forwards to the implementation of Vec.

* Fix build with OpenSSL 1.1.1 (tomusdrw#170)

* Fix build with OpenSSL 1.1.1
Update hyper to 0.12
Update hyper-tls to 0.3
update websocket to 0.21
Update http.rs to new hyper 0.12 API
bump version

* fix comment placement

* Revise `Traces` namespace
remove custom deserialize, switch to untagged serde representation

bump ethabi to 6.0 (tomusdrw#156)

Bump version.

Bump ethereum types. (tomusdrw#108)

Use ethereum-types library for uints and hashes (tomusdrw#76)

* Use bigint library for types.

* In progress.

* Use ethereum-types

* Update dependencies.

Added Copy trait to BlockNumber. (tomusdrw#66)