Bytes are immutable in python, which means that repeatedly appending
to them is _quadratic_ in time.  That is, we would like and expect
that deleting 10k objects 10 times would take about as long as
deleting 100k, but because we repeatedly concatenate to a bytes object
in the loop, they are not:

    timeit.timeit(lambda: server.delete_multi(["foo"]*10000),number=10)
    # 0.5087270829999966
    timeit.timeit(lambda: server.delete_multi(["foo"]*100000),number=1)
    # 10.650619775999985

Switch to using `bytearray` in all places which handle variable
numbers of bytes.  After this change:

    timeit.timeit(lambda: server.delete_multi(["foo"]*10000),number=10)
    # 0.1197161969999998
    timeit.timeit(lambda: server.delete_multi(["foo"]*100000),number=1)
    # 0.1269589350000011

The protocol implements `default` and `time` arguments, but those
are not exposed in the client class implementation.

This adds those fields.

Bump pygments from 2.2.0 to 2.7.4 in /docs

Bumps [pygments](https://github.com/pygments/pygments) from 2.2.0 to 2.7.4.
- [Release notes](https://github.com/pygments/pygments/releases)
- [Changelog](https://github.com/pygments/pygments/blob/master/CHANGES)
- [Commits](https://github.com/pygments/pygments/compare/2.2.0...2.7.4

)

Signed-off-by: dependabot[bot] <support@github.com>

chore: move CI to GH

* Implement Protocol.__str__ for real consistent hashing + test

Add ability to return default value on get but breaking get's API

set_multi: Return a list of keys that failed to be set