Get Ethereum Relay to Compile (#21)

* Update dependencies

Upgrades Substrate based dependencies from v2.0.0 -> v2.0.0-alpha.1
and uses the `jsonrpsee`'s new feature flags. The actual code hasn't
been updated though, so this won't compile.

* Use `RawClient`s from `jsonrpsee`

* Update to use jsonrpsee's new API

* Hook up Ethereum Bridge Runtime, Relay, and Node Runtime

* Bump `parity-crypto` from v0.4 to v0.6

Fixes error when trying to compile tests. This was caused by
`parity-crypto` v0.4's use of `parity-secp256k1` over `secp256k1'.
Using the Parity fork meant multiple version of the same underlying
C library were being pulled in. `parity-crypto` v0.6 moved away from
this, only relying on `secp256k1` thus fixing the issue.

bridges/relays/substrate/Cargo.toml

@@ -13,8 +13,20 @@ env_logger = "0.7.1"
 futures = "0.3.1"
 jsonrpsee = { git = "https://github.com/paritytech/jsonrpsee", features = ["ws"] }
 log = "0.4.8"
-node-primitives = { version = "2.0.0", git = "https://github.com/paritytech/substrate" }
 serde_json = "1.0.41"
-sp-core = { version = "2.0.0", git = "https://github.com/paritytech/substrate.git" }
-sp-rpc = { version = "2.0.0", git = "https://github.com/paritytech/substrate.git" }
 url = "2.1.0"
+
+[dependencies.sp-core]
+version = "2.0.0-alpha.2"
+rev = "2afecf81ee19b8a6edb364b419190ea47c4a4a31"
+git = "https://github.com/paritytech/substrate/"
+
+[dependencies.sp-rpc]
+version = "2.0.0-alpha.2"
+rev = "2afecf81ee19b8a6edb364b419190ea47c4a4a31"
+git = "https://github.com/paritytech/substrate/"
+
+[dependencies.node-primitives]
+version = "2.0.0-alpha.2"
+rev = "2afecf81ee19b8a6edb364b419190ea47c4a4a31"
+git = "https://github.com/paritytech/substrate/"