Delay import of pkg_resources until needed (if ever). #195
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pkg_resources can be very slow to import (e.g. pypa/setuptools#926).
See rationale re: importance of import time in #194.
Alternatively, one could use importlib.resources on Py3.7+, but
then one needs to add version-conditional code for Py3.6 (or a
version-conditional dependency on importlib_resources).