feat: v0.4.5 - add immediate sell functionality and default implementations

- Bump version to 0.4.5
- Add Default traits for BondingCurveAccount and BonkParams
- Add immediate_sell methods for PumpFun and Bonk params
- Update README version references

src/common/bonding_curve.rs

@@ -32,7 +32,7 @@ use crate::{constants::pumpfun::global_constants::{INITIAL_REAL_TOKEN_RESERVES,
 use crate::solana_streamer_sdk::streaming::event_parser::protocols::pumpfun::PumpFunTradeEvent;
 
 /// Represents the global configuration account for token pricing and fees
-#[derive(Debug, Clone, Serialize, Deserialize)]
+#[derive(Debug, Clone, Serialize, Deserialize, Default)]
 pub struct BondingCurveAccount {
     /// Unique identifier for the bonding curve
     pub discriminator: u64,

src/trading/core/params.rs

@@ -104,6 +104,13 @@ pub struct PumpFunParams {
 }
 
 impl PumpFunParams {
+    pub fn immediate_sell(close_token_account_when_sell: bool) -> Self {
+        Self {
+            bonding_curve: Arc::new(BondingCurveAccount { ..Default::default() }),
+            close_token_account_when_sell: Some(close_token_account_when_sell),
+        }
+    }
+
     pub fn from_dev_trade(
         mint: &Pubkey,
         dev_token_amount: u64,
@@ -221,7 +228,7 @@ impl ProtocolParams for PumpSwapParams {
 
 /// Bonk protocol specific parameters
 /// Configuration parameters specific to Bonk trading protocol
-#[derive(Clone)]
+#[derive(Clone, Default)]
 pub struct BonkParams {
     pub virtual_base: u128,
     pub virtual_quote: u128,
@@ -234,6 +241,9 @@ pub struct BonkParams {
 }
 
 impl BonkParams {
+    pub fn immediate_sell() -> Self {
+        Self { auto_handle_wsol: true, ..Default::default() }
+    }
     pub fn from_trade(trade_info: BonkTradeEvent) -> Self {
         Self {
             virtual_base: trade_info.virtual_base as u128,