Publish new release on PyPI

[jlecoeur]

Please publish a new release on PyPI.

The latest release on PyPI has this bug #40, that is now fixed in master.

[huanglilong]

you can install by yourself

this works for me.
$ cd px4tools
$ sudo python3 setup.py build install

[jlecoeur]

@huanglilong yes, sure, this is what I did eventually.
It would be better to update the release on PyPi as pip is listed as an installation method (https://github.com/dronecrew/px4tools#using-pypi).