bump fst-reader to 0.8.7 #332

Job	Run time
Benchmarks (stable)	1m 17s
Try Examples (stable)	1m 4s
Check Minimum Rust Version	23s
Try Examples (beta)	1m 5s
Python tests (stable)	47s
Try Examples (nightly)	1m 2s
Check Semantic Versioning	2m 42s
Python tests (beta)	45s
Python tests (nightly)	42s
Test Serialization Feature ("serde1") (stable)	22s
Unit Tests (stable)	1m 15s
Unit Tests (beta)	1m 14s
Unit Tests (nightly)	1m 11s
Test Serialization Feature ("serde1") (beta)	25s
Test Serialization Feature ("serde1") (nightly)	22s
	14m 36s

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