Merge pull request #79 from tonton-sol/mine-event-log-add-balance

add post balance to MineEvent log

api/src/event.rs

@@ -6,6 +6,7 @@ pub struct MineEvent {
     pub difficulty: u64,
     pub reward: u64,
     pub timing: i64,
+    pub balance: u64,
 }
 
 #[repr(C)]

program/src/mine.rs

@@ -242,6 +242,7 @@ pub fn process_mine(accounts: &[AccountInfo], data: &[u8]) -> ProgramResult {
             difficulty: difficulty as u64,
             reward: reward_actual,
             timing: t.saturating_sub(t_liveness),
+            balance: proof.balance,
         }
         .to_bytes(),
     );