Prune leftover standalone dependencies (paritytech#282)

Author: JoshOrndorff

Cargo.lock

@@ -20,7 +20,6 @@ stake = { path = "../pallets/stake", default-features = false }
 pallet-author-filter = { path = "../pallets/author-filter", default-features = false }
 
 # Substrate dependencies
-pallet-aura = { git = "https://github.com/paritytech/substrate.git", default-features = false, branch = "master", optional = true }
 sp-std = { git = "https://github.com/paritytech/substrate", default-features = false, branch = "master" }
 sp-api = { git = "https://github.com/paritytech/substrate", default-features = false, branch = "master" }
 sp-io = { git = "https://github.com/paritytech/substrate", default-features = false, branch = "master" }
@@ -46,9 +45,6 @@ frame-system-rpc-runtime-api = { git = "https://github.com/paritytech/substrate"
 pallet-transaction-payment-rpc-runtime-api = { git = "https://github.com/paritytech/substrate", default-features = false, branch = "master" }
 pallet-evm = { git = "https://github.com/purestake/frontier", default-features = false, branch = "v0.6-moonbeam" }
 
-sp-consensus-aura = { default-features = false, git = "https://github.com/paritytech/substrate.git", branch = "master", optional = true }
-pallet-grandpa = { default-features = false, git = "https://github.com/paritytech/substrate.git", branch = "master", optional = true }
-
 pallet-ethereum = { default-features = false, git = "https://github.com/purestake/frontier", branch = "v0.6-moonbeam" }
 fp-rpc = { default-features = false, git = "https://github.com/purestake/frontier", branch = "v0.6-moonbeam" }