Fix missing license file in the Python bdist/wheel

https://packaging.python.org/en/latest/specifications/pyproject-toml/#license

cramjam-python/pyproject.toml

@@ -2,6 +2,7 @@
 name = "cramjam"
 keywords = ["compression", "decompression", "snappy", "zstd", "bz2", "gzip", "lz4", "brotli", "deflate"]
 requires-python = ">=3.7"
+license = { file = "LICENSE" }
 
 [project.urls]
 homepage = "https://github.com/milesgranger/pyrus-cramjam"