Accept anything with Buffer Protocol, remove numpy (#100)

- Adds support for anything which implements the buffer protocol
- As a result, removes need for numpy and PyBytes and PyByteArray
  implementations in BytesType variants

.github/workflows/CI.yml

@@ -122,11 +122,6 @@ jobs:
         pip install cramjam --no-index --find-links dist --force-reinstall
         pip install -r dev-requirements.txt
         make test
-    - name: Test no numpy installed works
-      if: matrix.target == 'x86_64'
-      run: |
-        pip uninstall numpy -y
-        python -m pytest tests/test_no_numpy.py
     - name: Upload wheels
       uses: actions/upload-artifact@v3
       with:

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cramjam"
-version = "2.7.0-rc1"
+version = "2.7.0-rc2"
 authors = ["Miles Granger <miles59923@gmail.com>"]
 edition = "2018"
 license = "MIT"
@@ -28,4 +28,3 @@ bzip2 = "^0.4"
 lz4 = "^1"
 flate2 = "1.0.25"
 zstd = "0.11.1+zstd.1.5.2"
-numpy = "^0.18"