Remove unused dependencies (#456)

eth2/utils/boolean-bitfield/Cargo.toml

@@ -11,7 +11,6 @@ eth2_ssz = { path = "../ssz" }
 bit-vec = "0.5.0"
 bit_reverse = "0.1"
 serde = "1.0"
-serde_derive = "1.0"
 tree_hash = { path = "../tree_hash" }
 
 [dev-dependencies]

eth2/utils/eth2_config/Cargo.toml

@@ -6,7 +6,6 @@ edition = "2018"
 
 [dependencies]
 clap = "2.32.0"
-dirs = "1.0.3"
 serde = "1.0"
 serde_derive = "1.0"
 toml = "^0.5"

eth2/utils/hashing/Cargo.toml

@@ -7,8 +7,6 @@ edition = "2018"
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies]
 ring = "0.14.6"
 
-[target.'cfg(target_arch = "wasm32")'.dependencies]
-sha2 = "0.8.0"
 
 [dev-dependencies]
 rustc-hex = "2.0.1"

eth2/utils/ssz/Cargo.toml

@@ -18,7 +18,4 @@ criterion = "0.2"
 eth2_ssz_derive = "0.1.0"
 
 [dependencies]
-bytes = "0.4.9"
 ethereum-types = "0.5"
-hex = "0.3"
-yaml-rust = "0.4"