Remove base64 dependency

We don't need base64 because rust-bitcoin already exposes a version of
that crate that we can use. Removing one more parallel dependency.

Cargo.toml

@@ -17,7 +17,6 @@ bdk-macros = "0.6"
 structopt = "0.3"
 serde_json = "1.0"
 log = "0.4"
-base64 = "0.11"
 zeroize = "<1.4.0"
 dirs-next = "2.0"
 env_logger = "0.7"

src/commands.rs

@@ -1388,7 +1388,7 @@ mod test {
     fn encode_psbt(psbt: PartiallySignedTransaction) -> Vec<u8> {
         let mut encoded = Vec::<u8>::new();
         psbt.consensus_encode(&mut encoded).unwrap();
-        let base64_psbt = base64::encode(&encoded);
+        let base64_psbt = bdk::bitcoin::base64::encode(&encoded);
 
         base64_psbt.as_bytes().to_vec()
     }

src/handlers.rs

@@ -27,6 +27,7 @@ use bdk::{database::BatchDatabase, wallet::AddressIndex, Error, FeeRate, Keychai
 
 use structopt::StructOpt;
 
+use bdk::bitcoin::base64;
 use bdk::bitcoin::consensus::encode::{deserialize, serialize, serialize_hex};
 #[cfg(any(
     feature = "electrum",
@@ -503,7 +504,7 @@ pub fn handle_ext_reserves_subcommand(
     let outpoints_per_addr = addresses
         .iter()
         .map(|address| {
-            let address = Address::from_str(&address)
+            let address = Address::from_str(address)
                 .map_err(|e| Error::Generic(format!("Invalid address: {:?}", e)))?;
             get_outpoints_for_address(address, &client, max_confirmation_height)
         })

src/utils.rs

@@ -282,7 +282,7 @@ pub(crate) fn new_blockchain(
             &Secp256k1::new(),
         )?;
 
-        let rpc_url = "http://".to_string() + &url;
+        let rpc_url = "http://".to_string() + url;
 
         let rpc_config = RpcConfig {
             url: rpc_url,
@@ -295,7 +295,7 @@ pub(crate) fn new_blockchain(
         AnyBlockchainConfig::Rpc(rpc_config)
     };
 
-    Ok(AnyBlockchain::from_config(&config)?)
+    AnyBlockchain::from_config(&config)
 }
 
 /// Create a new wallet from given wallet configuration options