Hello, great work so far! Thanks for another great module :)

I tested with fromFile and fromStream and .lz4 and .avro files are not properly detected.

LZ4 Magic Number:
4 Bytes, Little endian format. Value : 0x184D2204
https://fuchsia.googlesource.com/third_party/lz4/+/HEAD/doc/lz4_Frame_format.md

AVRO Magic Number:
Four bytes, ASCII 'O', 'b', 'j', followed by 1
http://avro.apache.org/docs/current/spec.html#Object+Container+Files