2021-02-01 version 1.4.2:
* Add the required Ruby version (>= 2.4) to avoid compilation errors on
older Ruby runtimes
* Drop the support of old Ruby versions explicitly (1.8, 1.9, 2.0, 2.1,
2.2, 2.3)
2021-01-27 version 1.4.1:
* Bugfix about the wrong string encoding longer than 256 bytes (#200)
2021-01-27 version 1.4.0:
* Introduce the optimization to use frozen/deduped keys for map objects
* Stop releasing fat gem (pre-built binaries) for mswin32 arch
environments
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