fix one off by one bug #360

Job	Run time
Benchmarks (stable)	1m 14s
Try Examples (stable)	55s
Python tests (stable)	39s
Try Examples (beta)	1m 3s
Check Minimum Rust Version	28s
Try Examples (nightly)	1m 3s
Python tests (beta)	40s
Check Semantic Versioning	21s
Python tests (nightly)	38s
Test Serialization Feature ("serde1") (stable)	16s
Unit Tests (stable)	1m 17s
Unit Tests (beta)	1m 18s
Unit Tests (nightly)	1m 23s
Test Serialization Feature ("serde1") (beta)	28s
Test Serialization Feature ("serde1") (nightly)	22s
	12m 5s

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