v1.0.4

fix: improve error handling (#24)

Updates `call` to raise an error when the plugin error is set and the
plugin returns 0

Related to #23

Update readme for 1.0 (#20)

feat: make it possible to add custom logging handler (#18)

Support for extism/extism#578

Update to `extism_sys==^1.0.0-rc7`

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Co-authored-by: Chris Dickinson <chris@dylibso.com>

use pypi-published extism_sys (#7)