v0.8

Added

• module-info.java: zstd now ships as a named JPMS module
  (module io.github.dfa1.zstd), exporting the single public API package.
  Module-path consumers grant --enable-native-access=io.github.dfa1.zstd
  instead of ALL-UNNAMED; classpath consumers are unaffected. See
  ADR 0011.