Feature/black format

[nklapste]

Using black formatting.

Features:

• black formatting over all python source files
• Added black formatting check in .travis.yml
• Added .pre-commit-config.yaml for usage of pre-commit

[severb]

Since Go's fmt, I'm all for opinionated code formatters—one less thing to worry about.

[Anthchirp]

I would suggest adding a file .pre-commit-config.yaml into the root directory with contents

repos:

# Automatic source code formatting
- repo: https://github.com/psf/black
  rev: stable
  hooks:
  - id: black
    args: [--safe, --quiet]

Then you can use pre-commit to ensure black is run automatically.

[codecov-io]

Codecov Report

Merging #120 into master will not change coverage. The diff coverage is 97.67%.

@@           Coverage Diff           @@
##           master     #120   +/-   ##
=======================================
  Coverage   95.97%   95.97%           
=======================================
  Files           3        3           
  Lines         273      273           
=======================================
  Hits          262      262           
  Misses         11       11

Impacted Files	Coverage Δ
graypy/rabbitmq.py	86.2% <100%> (ø)	:arrow_up:
graypy/__init__.py	71.42% <100%> (ø)	:arrow_up:
graypy/handler.py	99.51% <96.96%> (ø)	:arrow_up:

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