#90 fix CLI call with --config-file option

[tbcvl]

Cf. #90

New test without the fix:

$ pytest tests/acceptance/test_cli.py::test_configuration_file_from_cli
...
/home/tbcvl/Documents/dev/septentrion/septentrion/cli.py:37: in load_config
    ctx.default_map = configuration.load_configuration_files(value)
/home/tbcvl/Documents/dev/septentrion/septentrion/configuration.py:195: in load_configuration_files
    return parse_configuration_file(file_contents)
/home/tbcvl/Documents/dev/septentrion/septentrion/configuration.py:84: in parse_configuration_file
    parser.read_string(content)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <configparser.ConfigParser object at 0x7f14b5fa3438>
string = b'[septentrion]\nschema_version=20.10\ntarget_version=20.11\nschema_template=schema_{}.sql\nbefore_schema_file=\n    roles.sql\nafter_schema_file=\n    after_schemas.sql\nfixtures_template=fixtures_{}.sql\n', source = '<string>'

    def read_string(self, string, source='<string>'):
        """Read configuration from a given string."""
>       sfile = io.StringIO(string)
E       TypeError: initial_value must be str or None, not bytes

/usr/local/lib/python3.6/configparser.py:722: TypeError

I'm not familiar with septentrion architecture, feel free to tell me if there's a better place for the fix.

Successful PR Checklist:

• Tests
• bugfix, no documentation needed

[codecov]

Codecov Report

Merging #91 into master will increase coverage by 0.31%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #91      +/-   ##
==========================================
+ Coverage   78.66%   78.97%   +0.31%     
==========================================
  Files          15       15              
  Lines         642      642              
  Branches       81       81              
==========================================
+ Hits          505      507       +2     
+ Misses        127      126       -1     
+ Partials       10        9       -1     

Flag	Coverage Δ
#matrix.coverage-flag	78.97% <ø> (+0.31%)	⬆️

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Impacted Files	Coverage Δ
septentrion/cli.py	0.00% <ø> (ø)
septentrion/configuration.py	86.45% <0.00%> (+2.08%)	⬆️

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[tbcvl]

unit test added and better place for fix.

[ewjoachim]

I think your commit has no commit message... ?

The rest seems A-OK ! You're welcome to merge when the message is fixed.