Use zero existential deposit (#48)

* Update ED

* Update `candidacy_bond`

node/src/chain_spec.rs

@@ -25,7 +25,7 @@ use serde::{Deserialize, Serialize};
 // cumulus
 use cumulus_primitives_core::ParaId;
 // darwinia
-use darwinia_runtime::{AuraId, DarwiniaPrecompiles, EvmConfig, Runtime, EXISTENTIAL_DEPOSIT};
+use darwinia_runtime::{AuraId, DarwiniaPrecompiles, EvmConfig, Runtime};
 use dc_primitives::*;
 // frontier
 use fp_evm::GenesisAccount;
@@ -226,7 +226,7 @@ fn testnet_genesis(
 		parachain_info: darwinia_runtime::ParachainInfoConfig { parachain_id: id },
 		collator_selection: darwinia_runtime::CollatorSelectionConfig {
 			invulnerables: invulnerables.iter().cloned().map(|(acc, _)| acc).collect(),
-			candidacy_bond: EXISTENTIAL_DEPOSIT * 16,
+			candidacy_bond: UNIT,
 			..Default::default()
 		},
 		session: darwinia_runtime::SessionConfig {

node/src/command.rs

@@ -470,7 +470,10 @@ pub fn run() -> Result<()> {
 				log::info!("Parachain id: {:?}", id);
 				log::info!("Parachain Account: {}", parachain_account);
 				log::info!("Parachain genesis state: {}", genesis_state);
-				log::info!("Is collating: {}", if config.role.is_authority() { "yes" } else { "no" });
+				log::info!(
+					"Is collating: {}",
+					if config.role.is_authority() { "yes" } else { "no" }
+				);
 
 				crate::service::start_parachain_node(
 					config,

runtime/darwinia/src/lib.rs

@@ -209,8 +209,8 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
 	state_version: 1,
 };
 
-/// The existential deposit. Set to 1/10 of the Connected Relay Chain.
-pub const EXISTENTIAL_DEPOSIT: Balance = MILLIUNIT;
+/// The existential deposit.
+pub const EXISTENTIAL_DEPOSIT: Balance = 0;
 
 /// The version information used to identify this runtime when compiled natively.
 #[cfg(feature = "std")]