Remove slow PyPy from test matrix

Bump to v2.5.1

Merge branch 'windows' of github.com:elijahr/ringbuf

Add RingBuffer.reset() method

Signed-off-by: Elijah Shaw-Rutschman <elijahr@gmail.com>

Allow concatenate for any buffer types

Parallelize concatenate

Add concatenate

Add args and kwargs, for subclass support

Fix token