Update pyparsing to 2.4.7

[pyup-bot]

This PR updates pyparsing from 2.4.6 to 2.4.7.

Changelog

2.4.7

---------------------------------------------
- Backport of selected fixes from 3.0.0 work:
. Each bug with Regex expressions
. And expressions not properly constructing with generator
. Traceback abbreviation
. Bug in delta_time example
. Fix regexen in pyparsing_common.real and .sci_real
. Avoid FutureWarning on Python 3.7 or later
. Cleanup output in runTests if comments are embedded in test string

Links

• PyPI: https://pypi.org/project/pyparsing
• Changelog: https://pyup.io/changelogs/pyparsing/
• Repo: https://github.com/pyparsing/pyparsing/
• Docs: https://pythonhosted.org/pyparsing/