bump charlock_holmes to 0.7.0
use charlock 0.7.1 or better
Merge pull request #1187 from github/bump-charlock

Bump charlock_holmes to 0.7.0
Add a multitude of Forth file extensions.
Yes, these are all in use.
Add Groff sample.
Update samples.json.
Make test_pedantic accept quotes around extensions.