Set unicode_errors in Unpacker

[Shougo]

Fix #438

[tjdevries]

@teto do you have permissions to merge here or no?

[jamessan]

Is there a test that can be added for this, similar to test_invalid_utf8 in test_buffer.py?

[teto]

@tjdevries nope :(

[Shougo]

Is there a test that can be added for this, similar to test_invalid_utf8 in test_buffer.py?

I think the tests are already added.
But msgpack 0.6.2 is used in previous CI.
https://travis-ci.org/github/neovim/pynvim/jobs/647230783

[Shougo]

Travis CI tests are not executed in current PR.
Why?

[Shougo]

Note: msgpack 1.0 is released in Feb17.

pynvim's last commit is Feb 7.
Oh...

[jamessan]

Ok, so re-running a job from the last master commit shows the timeout failure, since it's now running against msgpack 1.0.

This branch doesn't hit the timeout, but it does fail the invalid utf8 test.

[Shougo]

OK. I will check it.

[Shougo]

I have fixed the error.

[Shougo]

Fixed Python 2.7 unicode_errors.

[Shougo]

Thank you!