Fix missing space in static_assert (#569) #417

Job	Run time
windows-msvc-shared (MSGPACK)	5m 43s
windows-msvc-shared (CBOR)	8m 24s
windows-msvc-shared (FLEXBUFFERS)	6m 35s
windows-msvc-shared (CAPNPROTO)	8m 14s
windows-msvc-shared (UBJSON)	8m 24s
windows-msvc-shared (YAML)	4m 46s
windows-msvc-shared (AVRO)	7m 16s
windows-msvc-shared (JSON)	10m 45s
windows-msvc-shared (TOML)	4m 59s
windows-msvc-shared (PARQUET)	39m 49s
windows-msvc-shared (XML)	3m 55s
windows-msvc (AVRO)	6m 52s
windows-msvc (MSGPACK)	3m 30s
windows-msvc (UBJSON)	6m 54s
windows-msvc (JSON)	11m 21s
windows-msvc (XML)	3m 31s
windows-msvc (CAPNPROTO)	8m 5s
windows-msvc (TOML)	4m 25s
windows-msvc (YAML)	4m 2s
windows-msvc (CBOR)	8m 21s
windows-msvc (FLEXBUFFERS)	5m 16s
windows-msvc (benchmarks)	49m 2s
windows-msvc (PARQUET)	38m 49s
	4h 18m 58s

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