use __all__ to avoid noqa

[RonnyPfannschmidt]

opentracing-python/opentracing/__init__.py

Lines 23 to 34 in a86ee3d

	from .span import Span # noqa
	from .span import SpanContext # noqa
	from .tracer import child_of # noqa
	from .tracer import follows_from # noqa
	from .tracer import Reference # noqa
	from .tracer import ReferenceType # noqa
	from .tracer import Tracer # noqa
	from .tracer import start_child_span # noqa
	from .propagation import Format # noqa
	from .propagation import InvalidCarrierException # noqa
	from .propagation import SpanContextCorruptedException # noqa
	from .propagation import UnsupportedFormatException # noqa

[kasium]

Hey, I've just seen this issue. What's about to use the per file ignore feature of flake8?

per-file-ignores =
    opentracing/*/__init__.py:F401