Merge pull request #94 from EspressoSystems/fix/sql

Fix typo in state DB SQL migration

db/migrations/state/0001.sql

@@ -40,7 +40,7 @@ CREATE TABLE state.virtual_batch
     batch_num BIGINT PRIMARY KEY REFERENCES state.batch (batch_num) ON DELETE CASCADE,
     tx_hash   VARCHAR,
     coinbase  VARCHAR,
-    block_num BIGINT NOT NULL REFERENCES state.block (block_num) ON DELETE CASCADE
+    block_num BIGINT NOT NULL REFERENCES state.block (block_num) ON DELETE CASCADE,
     seen_at BIGINT NOT NULL REFERENCES state.block (block_num) ON DELETE CASCADE
 );