Psd-tools

------------------

- [composite] Implement NumPy-based compositing functionality.
- [composite] Support blending modes other than dissolve.
- [composite] Support blending in RGB, CMYK, Grayscale.
- [api] Introduce NumPy array export method.
- [api] Drop deprecated methods from v1.7.x such as `as_PIL`.
- [api] Deprecate `compose` method.
- [compression] Rename packbits to rle.
- [compression] Improve RLE decode efficiency.
- [tests] Additional compositing tests.

-------------------

- [composer] fix crash when gradient fill is in stroke.

-------------------

- [compression] Remove packbits dependency and introduce cython implementation.
- [deploy] Move CI provider from Travis-CI to Github Actions.
- [deploy] Start distributing binary wheels.

-------------------

- [psd] add safeguard for malformed global layer mask info parser.

-------------------

- [api] remove duplicate `has_mask()` definition.
- [composer] fix empty effects check.

-------------------

- [api] fix `compose()` arguments.
- [psd] fix attrs version dependency.