Skip coverage in "colour.describe_environment" definition.
@@ -538,7 +538,7 @@ def describe_environment(runtime_packages=True,
# NOTE: A few clauses are not reached and a few packages are not available
# during continuous integration and are thus ignored for coverage.
- try:
+ try: # pragma: no cover
version = subprocess.check_output( # nosec
['git', 'describe'],
cwd=colour.__path__[0],
