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Each coala bear should include a PipRequirement to describe any Python dependencies.

For example, CMakeLintBear includes:

REQUIREMENTS = {PipRequirement('cmakelint', '1.3')}

requirements.txt also includes cmakelint~=1.3. This is unnecessary duplication, and the task is to remove that duplication.

This task is to create a script .ci/generate_requirements.py which is run after coala-bears is installed and writes a new bear-requirements.txt using the PipRequirement information in the bears, using pip ~= syntax.

Each entry in the new bear-requirements.txt should be removed from the existing requirements.txt, and bears-requirements.txt should be loaded by setup.py so that there is no change to the package dependencies.