v0.2.3

Added

• (c-api) the experimental zstd.h and zdict.h surface (#602)

Fixed

• (decoder) hand out every decoded byte, not only what left the window (#605)
• (encoder) take table pointers from the table, not a slice (#598)

Testing

• (ci) prove the drop-in claim against upstream's suites, the reference CLI and real consumers (#610)
• run the lsm tests in CI and fix the one that rotted (#608)