Fix spec.

Author: Jeff Dutil

spec/aws/session_store/dynamo_db/garbage_collection_spec.rb

@@ -113,7 +113,7 @@ def collect_garbage
       dynamo_db_client.should_receive(:scan).
         exactly(1).times.and_return(scan_resp2)
       dynamo_db_client.should_receive(:scan).
-        exactly(1).times.with(hash_including({:exclusive_start_key => scan_resp2.last_evaluated_key})).
+        exactly(1).times.with(hash_including(exclusive_start_key: scan_resp2[:last_evaluated_key])).
         and_return(scan_resp3)
       dynamo_db_client.should_receive(:batch_write_item).
         exactly(3).times.and_return(write_resp1)