Use thiserror instead of derive_more (#44)

- Use thiserror instead of derive_more
- Format code
- Fix clippy warnings
- Add LICENSE_TEMPLATE

Signed-off-by: koushiro <koushiro.cqx@gmail.com>

src/frame/balances.rs

@@ -1,24 +1,47 @@
+// Copyright 2019 Parity Technologies (UK) Ltd.
+// This file is part of substrate-subxt.
+//
+// subxt is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// subxt is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with substrate-subxt.  If not, see <http://www.gnu.org/licenses/>.
+
 //! Implements support for the pallet_balances module.
-use crate::{
-    error::Error,
-    frame::{
-        Call,
-        system::System,
-    },
-    Client,
-};
+
+use std::fmt::Debug;
+
 use futures::future::{
     self,
     Future,
 };
-use parity_scale_codec::{Encode, Codec};
+use parity_scale_codec::{
+    Codec,
+    Encode,
+};
+
 use runtime_primitives::traits::{
     MaybeSerialize,
     Member,
     SimpleArithmetic,
 };
 use runtime_support::Parameter;
-use std::fmt::Debug;
+
+use crate::{
+    error::Error,
+    frame::{
+        system::System,
+        Call,
+    },
+    Client,
+};
 
 /// The subset of the `pallet_balances::Trait` that a client must implement.
 pub trait Balances: System {
@@ -99,7 +122,7 @@ const TRANSFER: &str = "transfer";
 pub struct TransferArgs<T: Balances> {
     to: <T as System>::Address,
     #[codec(compact)]
-    amount: <T as Balances>::Balance
+    amount: <T as Balances>::Balance,
 }
 
 /// Transfer some liquid free balance to another account.